Terrible Customer Experience

I have been with MTN for several years and when my contract expired I went on a month on Month and then in February i tried to cancel the package and was offered a retention package at R199 per month, that was an issue as the consultant informed me that there was a technical issue on their side, the next month end the full amount went off, the upgrade one month later could not be done due to the technical issue, I called MTN to ask them to credit me the difference as this was an error on their side and not mine, this was in April 2025, to which the consultant who assisted me informed me that they sent the request through to their supervisor, fast track to 27 June, the debit order amount changed due to me stopping that amount of the old contact, only to find out when I had to follow up was that nothing was done and then the consultant who i spoke to in February who informed me that she sent the request to her supervisor was going to send the request again to her supervisor. no response received from MTN, ABSOLUTELY DISGUTED