Cancelled contract debited again!

Cancelling my Dad's number after his passing has been a nightmare! I have been an MTN customer for 27 years & am now likely to move.

On the 12th of May, I asked for verification of the settlement amount having been paid for my Dad's contract & for MTN to proceed with cancellation. Hearing nothing back, I assumed all was well. Imagine my surprise when the contract amount started to be debited again! Grrr! I called 135 & nothing changed. I called again & was told it's been escalated. No feedback. Tried 135 again today after work - went from the ironically-named Customer Care Champion to Cancellations (who struggled to understand me) & then was put through to Billing - who ended the call after a short "our office hours are..." automated message at 17:01. Am I loving MTN right now? Not so much.