Disgraceful Service and Customer Support

I have been an MTN contract customer for over 20 years now and for the past 2 odd years, every single month my phone is suspended on the 1st or 2nd of the month? I pay my bill every single month without fail, all be it 2-5 days late, its paid every month. Late is also not even a full 30 days from my invoice date which is the 7th of each month, my due date is the 28th that's only 21 days. my confirmation of payment goes to both the supp**** email address and fax number, yet I still stay suspended until I call and speak to at least 4 un-intelligent, don't give a damn operators, that's if I can get through! C'mon MTN! Surely you can distinguish bad and overdue accounts from someone that does pay every month??? This is beyond frustrating!