Cancellation of contract

I'm really upset that today is my birthday and I have to write such reports. My contract ended on 18/05/2015 and I called the contact centre on 19/05/2015 to request for it to be cancelled and number to be switched to prepaid. Thuthu informed me that it takes 5 days to cancel the contract and that cancellations will call me to confirm the cancellation. ***. Till this day, I have not been called. My phone has been suspended because they made a direct debit on the 01/06/2015 and I did a reverse debit. Why would they want to still take my money when the contract is finished and I called to cancel it? On the 30/06/2015, I went to East Gate mall to see how they can help me since the contact centre is closed and I cannot get through to anyone. The guy informed me that the account shows that I am in arrears. This is so infuriating because I have never skipped any payments for MTN except the one I reversed in the beginning of June 2015. I need my contract cancelled immediately and number switched to prepaid and also deserve to be highly compensated for this inconvenience caused. My grandfather is in a critical state and my form of communication is cut off!! Sort this out ASAP!