Cancelled my contract but they still deduct money

I cancelled my 1 contract with TelkomSA on the 14th of January 2016 and on the 20th they took the regular payment and on the 20th of February TelkomSA took over R756,00. I phoned them to ask what is going on, I cancelled one of my contracts and they said they can't help me over the phone and that I have to go to the nearest TelkomSA branch and they will help me. Instead I went to ABSA and reversed the debit order. It wasn't my job to go to TelkomSA and sort out what was already sort out. On the 15 of March TelkomSA took R1191.00 from my account saying that I owe them R1191.00. First of all, I went to TelkomSA to cancel my contract because the contract expired on the 21 of January 2016. I was at the same branch, Alberton, on the 14 of January 2016 and to top it of the f__king sim card is cut up, but I get billed for a contract that was cancel on the 14 of January 2016. Ever time TelkomSA deducts money from my account I will reversed that amount. F__K YOU VERY MUCH, TELKOMSA.