Worst service that I have ever received from a mobile service provider.

Nearing a year of emails and calls and still no success. MTN has been billing me for a contract that expired in 2020 - even after I gave them more than enough notice that I would like to cancel the contract at expiry. Not only are they still billing me - but they also debited my account on several occasions and are yet to refund me. I have received nothing but pathetic service from them.