Have to pay for unauthorised service for 3 months

Hi,<br> <br> My previous contract with Telkom expired at the end of December 2014. With that contract there was a special that gave 5Gb of data for free every month. Early in January I took out a new contract with them and did not ask for any extra data per month. To me it was obvious the extra 5Gb per month on the previous contract expired with that contact.<br> <br> At the end of January Telkom charged me R630.45 for \1 x Add On Internet bundle\" that I did not request. I immediately phoned their call centre and the person said they made a mistake and I will be credited for that data. At the end of January they again charged me for 5Gb data and credited me for February but not January. I do not have the accounts (although I told the help desk person I don't get it by mail or email) but the same happened at the en of February and March. Every time I phone and the ensure me it is fixed and I am actually in credit and should have to pay anything. I said I don't believe her and I was right, not only have I have to pay , but I am still paying for data I did not request and asked them in January to stop.<br> <br> I expect this to be resolved asap with cash in the bank or a statement saying how much I am credit"