CANCELLATION OF CONTRACT

I had a CellC contract cellnr ***. My phone got ****** in July 2015. I contacted CellC contract departement to cancel contract and ask for settlement amount that was R4499.50. On July the 8th I deposit R4499.50 into their account. On 31st August the amount of R4499.50 was deducted from my account. I reverse the amount and cancel debitorder at bank. I phoned them refnr *** and they said they will rectify problem. On 25th September two seperate amounts of R2249.75 total R4499.50 was deducted again from my account. I phone them refnr. *** and the same story. I email/fax them proof of payment. On 28th September I phone to hear if they received email/fax refnr. ***. On 30th September the amount of R4499.50 was deducted again from my account. I phone them refnr ***. They said they will phone me back in 2 working days and I received a sms about my query and that it will be resolved. Up to date no response. I spend a lot of money on calls/bankfees. Please help. Unhappy customer.