Contract bought out but still deducting money!

I bought out my contract in November and paid the amount that was given to me. The contract was cancelled the same day. At the end of December an amount of R835 was deducted from my bank account. After inquiring about this, I was told that it was wrongfully deducted and that I should go to the bank and reverse the transaction myself. Went to the bank and they are unable to assist me.<br> <br> Cell C is now making their mistake my problem.<br> <br> Please refund me the money back into my bank account.