False adverti*****t/Bad customer service

Been a MTN loyal customer for over 5 years in May 2017 was offered a data contract of 2 gig which I was told will be paying R89 per month and it can be cancelled anytime ..Mtn been billing me R147 for the past 4 months spoke a consultant Nthabiseng on the 4th October 2017 regarding the billing was advised that it will be fixed and will be refunded I decided to cancel the contract since I was told it can be cancelled anytime consultant adviced me I needed to pay R500 cancellation i told her was not told about that asked her to send request to retrieve the call she said turn around time 24 hours a week later I called in again spoke to the other consultant Tumelo who advise query has been escalated .they debited again R 147 on the 20/10/17 and still awaiting feedback and the recording of the call for that data sale ,refund and cancellation I'm not happy with the service need this resolved asap reference for the call ********** 76