rain data *****ing money

CAncelled at end of january and sim was not working from beginning of february stil have to pay at march and end april and believe me to get contacted by them is like finding a cat in the middel of the sea//and i went to the bank to stop the debit every month all they said is they cant rain should do it at their end all they do is ***** your money im going to the court monday about this due to you have to pay upfront before using the sim but when you cancel it you have to pay again then they spin you **** like its pro rata?***