MTN - Terrible aftermarket support - Paying for a phone I don't have

I took out a business contract on an iPhone 11 late in 2019. But all my iPhone chargers were burning out upon charging the iPhone (as I have other Apple devices with the lightning charger, which are all damaged now). So on the 4th of January 2020, I took the device to the MTN store in Fourways Mall and booked it in for a warranty assessment. I have made countless calls to MTN and exchanged several emails. For the first few weeks, nobody could tell me where the device was. There was absolutely no feedback received. Up until today, I have no idea where the device is, I have no feedback on the outcome of the warranty assessment, I have no idea when I can expect the device back. But every month MTN is very timely in debiting my account in excess of R1500 for this contract. Their aftermarket service is pathetic. It seems that they lure their customers in and then forgot about them. The aftermarket service is terrible and my staff, which were supposed to all be consolidated under this MTN contract, will now be moved over to Vodacom.