Late payment charges
Question

                Assalamu alikum 
My question concerns bills related to telephone or university tuition. If you 
delay the payment of the telephone bill they add an extra amount by a certain 
percentage of the bill and if you further delay by another month an extra 
amount is added to the previous total using the same percentage on the whole 
amount. 
Are these extra amounts riba or if it is not riba is it still haram to pay this extra 
amount? 
Jazakallah kheir
Praise be to Allah.Al-hamdu lillaah.
Yes, this extra amount is undoubtedly considered ribaa, as the longer period for 
payment they allow you the more they increase the amount for you to pay. You need to 
refuse this kind of transaction. If you are forced, then pay the original sum without the 
extra amount. If you are forced to pay the extra amount, then pay it while offering 
repentance to Allaah and committing not to deal in such transactions again.