Want my contract cancelled.

The debit order didn't go off my bank account after numerous complaints to the call centre, I received messages that my service will be suspended, I will pay for returned debit orders and that I have been handed over to XDS a registered credit bureau for non payment, this now reflects on my credit record. I went in store to complain and was told that all my details on the system is correct, when I asked to have a look on the system I found that the bank account number was captured incorrect. I asked if data and minutes will carry over if I don't use it all and I was told that only the minutes will carry over for three months, I was happy with this and signed for the contract, this is not happening. I went in store to complain again, 02/09/2015, and was told that the manager will get back to me by 3 o' clock on 03/09/2015 I am still waiting. You are in breach of contract Cell C, I want this contract cancelled.