Poor service from MTN Benmore branch which boarders on ineffeficients potentially ********** behaviour.

I entered into a contract with MTN for 10 GB +- 6 months ago at Northgate shopping centre. After 2 months my daughter and I went to the Benmore branch and filled in an amendment form to reduce it to 5 GB where the premium was supposed to be reduced from R299 to R199 but this didn't happen. I have a cell phone contract with them that I renewed and upgraded my phone contract to a J5 Prime for the following 2 years. I then complained at the MTN branch on Rivonia and Summit Rds, where I renewed and upgraded my contract Sandton police station. The lady advising us there said she couldn't do anything about it but I must call at the Benmore branch where I made the amendment which they never bothered to action. having been very busy I called at the MTN Benmore branch on Friday 18th of January and spoke to the young man on duty and complained about this matter and the lady in question who was to dealt with this amendment was dealing with another client. I then asked to speak to the manager and the young man informed me that he was on leave and I was kept waiting for a couple of minutes - I walked out and told them I was going on Hello Peter.com and they were indifferent about this matter. They just ignored me. I now seek compensation from MTN of the +- R500 + addiotional R1000 compensation for the gross inconvenience and lousy service that was taken off my account without my consent. MTN need loyal clients and this is the 3rd contract I have signed with them. I don't believe that they know very much about customer service and loyalty and therefore repeat business.