MTN Customer Care is a waste if Time!

The account which is with MTN has been active for more than 20 years. Each month you pay our subscription as this is a caped line and then out of the blue they suspend your line. You ask why and there response is there is an amount due, when you ask why they can not give clear feedback, just you must pay the amount. Your subscription is what it is each month and when its paid in full each month how can there be any funds due? I have paid earlier each month than what is requested and never heard of an outstanding amount. However i paid the amount and just for them to allocate it they need you to answer how many questions. The point is the funds have been paid and allocation is not a difficult thing to do. And don't even get me started when you try calling customer care. Don't know why they even bother having a customer care line. They keep asking for proof of payment which i have literally mailed them now more than 6 times and still no allocation and the line is suspended. Its a disgrace to think you are a loyal client for so many years and then they carry on like this over less than R80.00!!