Pathetic Service at MTN

We bought 2Iphone contract phones and 20GB Wifi in November 2017. The consultant that was helping us was Ayanda. MTN debited R5379.18 on the 1st January 2018, we went to the store to query this, we were advised that the contract was initially captured incorrectly, therefore we were advised to reverse that amount, MTN will come back to us to advise how much difference we need to pay. Dikeledi logged a request to get the head office and billing department that was on the 1st week of January. We went back on the 2nd week of January to find out how much we need to pay, we found out that the incident was ressolved without any resolutions to the query. MTN kept on suspending our lines (numerous of times) and had to go back to the store to unsuspend but no one was able to advise us how much we should be paying. Right now we getting harrased on sms about the payment, suspension of phones and Legal Actions to be taken against us but when we go to the store no one is able to help. Is it our fault that people dont know their jobs and billing procedures? Is it our fault that we were charged incorrectly ? I called their offices today 29/01/2018 spoke to Quinton (Mall of Africa ) advising him that we need an update, he promised that hes going to get Dikeledi to call us back with the update. No one had called us till this hour. The incident has been pending for an hour without any resolutions or feedback. The service is soo pathetic as no one is willing to help and not taking this seriously. We would like the WIFI cancelled and returned because we were advised that we were charged R3000 for 20 GB. Please tell me if that makes any sense. Its not even an uncapped data but the amout is just craxy. We want that returned and pay the difference for our phones