I want OUT Now!

I have been trying unsuccessfully to cancel my contract with MTN. My contract ended and I gave them a month's notice for cancellation as required by CPA, asked the agent if it had to be in writing and they said no. They could not sort out my sort out my billing queries and could not even give me answers as to why my debit order is almost three times the normal amount for a few months when my usage hadn't increased. Even asked for itemised billing which I have been waiting more than a month for-no email. Please cancel my contract and give me the balance for cancelling the other two so I can either pay it off or get Cell C to buy me out. My line is now suspended due to high usage-no one can tell me how much I used or why it is suspended when my balance still reflects a 1.92 Gig balance. I don't feel valued as a customer and would rather take my money elsewhere. I have had it MTN and it's poor service or lack thereof...I want OUT