The general term restitution describes the act of restoration. The term is used in different areas of the law but carries the same meaning throughout. The basic purpose of restitution is to achieve fairness and prevent the Unjust Enrichment of a party.
Phone number for Square is 877-417-4551. Although, it seems to be a recorded message. I found a great alternative to Square that offers live 24/7 customer support with real human beings to speak with! Go to http://www.mobilecardreader.biz/.
To answer your original question, in the future if you wanted to speak with Customer Service over the phone you can call 800-922-0204 or dial *611 send from your cell phone. You can follow the prompts so you are routed to the appreciate department or you can just hit 0 until you are directed to a representative.