MTN bad customer service

I have 424 minutes airtime which accumulates as part of my mtn contract. I live in a small town and MTN has disabled their lines, when I phone another number the person cannot hear me but I can clearly hear them. Do Not Tell me its the microphone, it is a brand new Huawei Nova Y90 handset (5days old), I can send voice notes, attend Zoom meetings etc, so it is Not the microphone! It is pointless to phone customer service, they do Not take calls from non MTN calls e.g. Vodacom! I was forced to get a Vodacom card and I can make calls on that card. I dearly regret signing up with mtn, your customer care is not bad, it is Non Existing! Please Note, Do Not try to phone me on my mtn number, you will Not be able to hear me 😂