Fedup with poor service

The Retentions Unit of the MTN is taking too long to cancel my contract, initiated on 27 October 2020 and 2 subsequent requests submitted. Much as MTN has acknowledged receipt of my compalaint, it should not take that long to cancel a contract that has long expired. This has cost implications on my side, so for 4 months am paying a contract that I have decided to cancel, only because of not wanting to be listed in the credit Bureau for non-payment.