MTN Contract bad service

During late 2021 I app**** for an MTN Sim only contract deal. Got approved and the order was scheduled for delivery. Because I needed the sim urgently for work I had to cancel and got a vodacom sim instead which was ordered after the MTN one and got delivered before the MTN sim. I called and emailed to cancel the sim only deal in the time frame allowed by the TOC's. After back and forth via email I haven't received any response and assumed the account was canceled and closed.

A few months later I noticed attempts to debit my bank account and every time I disputed it because I have not given them permission to debit after I have cancelled the account.

Upon checking my credit score on clear score I saw that I defaulted on the MTN account and as a result damaged my credit history. I have emailed the legal department which placed me in contact with the sales admin department. At first they were once again very proactive and then they lost fire and still haven't responded for two weeks after u have sent follow up emails about the situation.

The service I have received made sure I will never make use of MTN as a network provider.

Really annoyed and disappointed.