Campus Square Staff- Unhelpful

Two months ago I logged a complaint as I have been experiencing poor/no signal whilst at home and at work. I didn't receive any feedback from MTN regarding this complaint. Saturday, 21 March, I decided to go into the MTN store in Campus Square to get the problem looked into. A staff member suggested I do a sim swap, as it might be that my sim card was damaged when being cut to fit the micro sim slot. I requested a sim swap to be done while in the shop and was informed that the sim swap would be active within 2 - 24 hours. I followed up with the Call Centre on Sunday, 22 March, and was informed that no sim swap was processed. I then called MTN Campus Square again, and struggled to get through to them for app. 2 hours. After getting through to a consultant, she informed me that she would investigate the matter and call me back. This did not happen. I the tried to call them on numerous occasions thereafter, but their phone just kept ringing. I kept trying for more than 2 hours thereafter, with still no success. All these calls were however made during their working hours as I checked this on their website. I will be cancelling all active contract with MTN!