BAD SERVICE

Hi, I had my contract renewal done in December 2014. Cell ***. I spoke to someone in Jan from the call centre to query the billing for the month, and according to the guy, January would be the last month I get charged for the old contract as well seeing that my contract only ended 31Jan. So I left it. Then come 12th Feb, I get a statement of account, I queired again, spoke to a guy , he said there was some additional charge for some data bundle which was added on. According to me I did not request that, neither did he have any proof that I did, my bill read R580. and some change, he said he will have that cancelled for me. I should only be getting billed for my contracts and that is inclusive of 100minutes, part of the contract. no extra's. After the phone call I get another sms for my statement for R401 some change, which I thought was now all sorted out. But then I get debited on the 28/02 and still get debited R580 some change. And I still think the data bundle (THAT WAS NOT RQUESTED BY ME) is still appearing on the account charge even for the coming month..I have been A GOOD Customer for many years. PLEASE Can this be sorted ASAP. I am not prepared to make another call