Overcharged on my telkom mobile account.

Hi<br> <br> My contract ended in December 2015 with Telkom Mobile, I went in and filled in the cancellation forms to cancel the contract, 2 weeks later I received a call from Telkom Mobile wanting to know if I wanted to stay on with them for R 99.00 a month and they would give me everything I was getting on my current contract which I was paying R 369.00 a month. They also said that they would give me 500mb additional data per month at R 99.00/month.<br> <br> On the 1st of January I was charged R 99.00 for the month, then on Wednesday 27.01.2016 I got an sms stating that my account will be debited on the 01.02.2016 with the amount of R 710.1.<br> <br> I then called in and spoke to a call centre agent who then said to me that he will forward my request to the relevant department and they should get back to me by Friday/Monday for the latest. So then knowing that the 01.02.2016 was Monday I called them on Friday the 29.02.2016 because I did not want my account debited. I spoke to Katie who assured me that the reversal will be done and only R 99.00 would be deducted.<br> So last night 01.02.2016 an amount of R 710.21 was deducted and I called Telkom Mobile today and they are telling that I must just wait.