Incorrect Billing (4 Months in a row)

I upgraded in October 2015. After being promised new benefits and no extra fees. Month one, R1586.16 was debited. After querying, I was told that I have been double charged for my device and have an additional 5G data added to my account which I did not ask for or receive. They said that they will have to listen to the recording when the upgrade was done. Till date, nobody can give me the answer as to where my recording is. In November, December and January, I have been charged an additional R349 per month. Management have confirmed that the error was on their side and they will get back to me within 72 hours. I have to continuously phone them for feedback. On 27/01/2016, a manager phoned me and apologised for Telkom's mistake and promised me my account would be in credit with just over R1500 and nothing will be debited off my account end of January. He confirmed this 3 times. End of January, they deduct a further R1093. After phoning them AGAIN, they apologised and refunded me R488.63. I have queried why they have deducted the amount in the first place and also why my full refund (Now sitting at over R2200) has not be credited to my bank account. I request a FULL REFUND IMMEDIETLY