The muezzin gave the adhaan seven minutes before the proper time and they broke their fast
Question

                We broke our fast when the neighbourhood muezzin gave the adhaan, and seven minutes later we heard another muezzin. After asking our local muezzin we found out that he had given the adhaan by mistake, thinking that the time had started. What should the people of our neighbourhood do?.
Praise be to Allah.
    If a person breaks his fast thinking that the sun has set, 
    then he finds out that it had not set, he has to make up that day. This is 
    the view of the majority of scholars. 

    Ibn Qudaamah (may Allaah have mercy on him) said in 
    al-Mughni (4/389): 

    This is the view of most of the scholars, fuqaha’ and others. 
    End quote. 

    The Standing Committee was asked about a man who broke his 
    fast based on his two daughters’ saying that the sun had set, then when he 
    went out to pray, he heard the muezzin giving the call for Maghrib prayer. 

    They replied: 

    If you broke your fast after the sun had set, then you do not 
    have to make up that day. But if you find out or you think it most likely or 
    you are not sure whether you broke your fast before the sun set, then you 
    and those who broke their fast with you have to make up that day, because 
    the basic principle is that it was still daytime, and this principle cannot 
    be altered except in accordance with sharee’ah, which in this case means 
    when sunset happens. End quote. 

    Fataawa al-Lajnah al-Daa’imah, 
    10/288 
Shaykh Ibn Baaz was 
    asked about some people who broke their fast and then found out that the sun 
    had not set. He replied: 
The person to whom that 
    happened should refrain from eating and drinking until the sun sets, and he 
    has to make up that day according to the majority of scholars. There is no 
    sin on him if he broke his fast after doing his best to find out whether the 
    sun had set. This is like when a person wakes up during the day on the 
    thirtieth day of Sha’baan, then he finds out during the day that Ramadaan 
    has begun. He should refrain from eating and drinking for the rest of the 
    day, and he should make up that day according to the majority of scholars, 
    and there is no sin on him, because when he ate and drank he did not know 
    that it was Ramadaan. His ignorance of that means that there is no sin on 
    him. As for making it up, he must make it up. End quote. 

    Majmoo’ Fataawa Ibn Baaz, 
    15/288 

    Some scholars are of the view that fasting is valid in this 
    case, and that it is not essential to make it up. This was narrated from 
    Mujaahid and al-Hasan, and it is the view of Ishaaq and of Ahmad according 
    to one report, and of al-Muzani and Ibn Khuzaymah. It was the view favoured 
    by Shaykh al-Islam Ibn Taymiyah, and was regarded as more likely to be 
    correct by Ibn ‘Uthaymeen.  

    See Fath al-Baari, 4/200; Majmoo’ Fataawa li Shaykh 
    al-Islam, 25/231; al-Sharh al-Mumti’, 6/402-408 
They quoted as evidence 
    the hadeeth narrated by al-Bukhaari (1959) from Hishaam ibn ‘Urwah from 
    Faatimah from Asma’ bint Abi Bakr al-Siddeeq (may Allaah be pleased with 
    him) who said: “We broke our fast at the time of the Prophet  (peace and 
    blessings of Allaah be upon him) on a cloudy day, then the sun came out.” It 
    was said to Hishaam: Were they commanded to make it up? He said: It has to 
    be made up. Ma’mar said: I heard Hishaam say: I do not know whether they 
    made it up or not. 

    The words of Hishaam, “It has to be made up” were said by him 
    on the basis of his ijtihaad. He did not say that the Prophet  (peace 
    and blessings of Allaah be upon him) commanded them to make it up. Hence 
    al-Haafiz said:

     As for the hadeeth of Asma’, it cannot be deduced from it 
    that it should be made up or that it should not. End quote.  

    Shaykh Ibn ‘Uthaymeen said in al-Sharh al-Mumti’ 
    (6/402): 
So they broke their fast 
    during the day based on their assumption that the sun had set but they were 
    unaware not of the shar’i ruling but of the situation. They did not think 
    that it was still daytime. But the Prophet  (peace and blessings of 
    Allaah be upon him) did not tell them to make it up; if making it up had 
    been obligatory it would have been the law of Allaah and it would have been 
    known, but since it was not known and was not narrated from the Prophet  
    (peace and blessings of Allaah be upon him), the basic principle is that the 
    duty has been discharged and it does not have to be made up. End quote. 

    Shaykh al-Islam Ibn Taymiyah said in Majmoo’ al-Fataawa 
    (25/231): 
This indicates that it 
    is not obligatory to make it up. If the Prophet  (peace and blessings of 
    Allaah be upon him) had told them to make it up, that would have been well 
    known as it is narrated that they broke their fast. Since that was not 
    narrated, this indicates that he did not tell them to do that. If it is 
    said, that it was said to Hishaam ibn ‘Urwah, “Were they commanded to make 
    it up?” and he said, “Is there any other alternative?” – the answer is that 
    Hishaam said that on the basis of his own opinion and did not narrate that 
    in the hadeeth. The fact that he did not have any knowledge of that is 
    indicated by the fact that Ma’mar is reported to have said: I heard Hishaam 
    say: I do not know whether they made it up or not. Both were narrated from 
    him by al-Bukhaari. Hishaam narrated from his father ‘Urwah that they were 
    not commanded to make it up, and ‘Urwah was more knowledgeable than his 
    son.” End quote.

     If you want to be on the safe side and make up a day in its 
    place, then you are doing well. Making up one day is a simple matter, praise 
    be to Allaah, and there is no sin on you for what happened. 

    And Allaah knows best.