Vodacom ********s

Few years back I took out a Vodacom cellphone contract. The contract was for 24 months. On the 23rd Month I called the Vodacom call centre to stop and cancel debit order on the 24th month. The person advised saying that they cant stop or cancel the contract, I need to call again on the 24th month to stop and cancel the contract. I then called again on the 24th month to stop and cancel. Two month later I see a debit order going off my account for vodacom. I then filled in a dispute at the bank and reversed it, also filled in a stop payment. 3 months after contract expired and the contract was cancel Vodacom contacts me saying that I never cancelled the contract and that it. I explained to them that I cancelled it telephonically on the month of my last debit order. They then asked me if i received a reference number or letter to say that I cancelled or stopped the contract, I advised told them that I didn't receive and reference number or letter from them stating that I have cancelled. Now they have handed me over to their debt collectors which are threatening to blacklist me. Vodacom doesn't accept my explanation. How many other customers do they **** like this?