hilarious billing

On the 9th of Dec I signed the contract with mtn at the shop in Mokopane with a limit request. My instalments are supposed to be 500 monthly the contract I signed with Zanele provia phungula to my surprise I got a debt order of R 2799. 57 on the 20th Jan, I spoke to ivy ramashala about this and she requested me to send her the Contract with the invoice which I did . THIS QUERY HAS BEEN GOING ON AND ON AND I DON'T GET ANY JOY WITH THIS I SPOKE TO THE I'D IT THAT CANNOT EXPLAIN WHY THE BILL WAS OVER THE LIMIT *BLESSING KHANYE FROM THE CALL CENTRE HE CAN'T TELL ME WHAT WAS WRONG I EVEN SENT THE SUPERVISOR EMAIL (SHELL MNGUNI) HAVEN'T GOT ANY FEEDBACK STILL. AM OPTING TO TERMINATE THIS CONTRACT AND MOVE ON IF MTN IS ONLY HIRING *********** PEOPLE THAT CAN'T SOLVE THE PROBLEMS created by their staff. This service is appalling .If this is a problem and cannot be solved I am taking the matter further. Awaiting response! !!!!!@!!@!@@@@@@