MTN Vetting department - USELESS!!!

I have been struggling from 06/02/2024 to do an upgrade on my account. The problem is that MTN's vetting department needs to do a credit limit increase, but I don't think they have anyone working in that department because there are no response from them. I am very unhappy. I have been a customer at MTN for more then 10years and this is how they treat you. At the shops or even the call centers they just say "sorry, but we have to wait for the vetting department". Won't recommend MTN to anyone and won't continue with my contracts I have with them.