Nothing being done about MTN's bad service for years

MTN MEPF Shopping Centre Klerksdorp I am utterly disappointed with MTN services. I have absolutely no good memories since moving to MTN. I am on a contract with them

MTN keeps terminating my monthly data and airtime even though I pay every month with reason being that I need to pay more than the agreed amount, when confronted again the emloyees themselves don't know what is going on , on their system- surely if you've been working at MTN for a long period of time you should know how to do your job , yet it ends up without a valid reason of why I should pay more .

MTN is supposed to debit from my bank account where I get notified to pay my account at their store , since I work in the same Centre as MTN I go to pay , some months they request that I cannot pay through card , other months I can't pay with cash , surely a payment is a payment made ?

My smartphone which is on the contract got ****** , with request of my IMEI number that I provided they are unable to blacklist my smartphone or help me in any way with my dire situation . ( I wrote this review from my laptop , I have no other means of communication now) Being without a phone I enquired about when my upgrade will be , I am not eligible for an upgrade ever ?

I work at a cellular repair and accessories shop , our clients are just as unhappy with MTN services , this has also continued for years . Why is nothing being done ? Why is nothing changing despite the many complaints about MTN ?