MTN poor and slow service

If I could give a big 0 rating I would as MTN must be the worst company to communicate with (pardon the pun) I tried to cancel my contract at the beginning of the month in September however they refused to allow my change of contract from unlimited to prepaid until day after contract ending 15th. I waited until 16th to convert to prepaid and at the same time, I once again requested cancellation of contract with MTN. Eventually after several repeated requests, on Friday the prepaid was changed however I am STILL waiting for the cancellation to come through in order for FNB to finally port. 2 of my numbers to be ported and 1 total cancellation. So far I am still waiting on MTN to revert besides a response that their retentions department is extremely busy and will get to me when they can! All my incoming calls are going directly to voicemail and despite FNB trying to get the porting processed, MTN are delaying despite THEIR note that we can only change contract and cancel AFTER date they set. I have taken as much from MTN for 25+ years and this is the final straw. In all this time they have made it clear to me as a customer that they do not care for loyalty. The fact that their retention department is currently experiencing a backlog likely explains why I am probably one of many leaving this giant comms company who have still not learnt what customer centricity entails. I await with baited breathe, the final release from this company of my MTN contract cancellation.!