MTN - Billing and Customer Service - failing your clients

Over the past two months I have experienced challenges with the billing department and customer services department. My monthly payment was credited to my old account number and was not transferred to the new account. Phone lines were suspended, and no one has been able to assist in getting the matter resolved. To top matters off - SIM card is now not operational after the suspension of the line, and I have to do a SIM Swop at my expense. But can't do that because my account is in collection while await the billing department to transfer the payment from the old account to the new account number. I am beyond frustrated and will definitely be closing my MTN contracts as they expire. Been a loyal customer for 21 years! Please ensure that your customer service staff are properly trained and have the full knowledge on how to assist a client. The sad part of this is that I made two payments with the same reference number in January 2025 and only 1 payment is showing on my new account! Go figure!!!!!!!!!!!!!!!!!