Monthly charges on cancelled contract

Early last year our Cell C 3g contract expired and we were continuously billed. The contract amount even changed t over R100 more. In May 2015 an amount of approximately R1300 was paid as a settlement amount and the contract was supposed to be cancelled. This month we received a notice of more than R2000 which needs to be paid for the cancelled contract which we are clearly still being billed for.<br> <br> Needless to say, it is impossible to get any assistance at the call centres if you are lucky enough to find a live body who answers you after holding on for more than an hour