MTN INCONSISTENT AND POOR SERVICE

I had an account with MTN that was handed over and I opted to settle my account with an amount of R2865.68 this was on the 15th January 2021. I therefore requested for a settlement letter which I was told it will take 3working days it's been 2 weeks and a couple of days and haven't received any thing on my email, I called more than 3 times trying to get assistance. These are unprofessional companies that I will come back a few years later to say that you haven't been paid your account and claim that you still owe them, This is a huge disappointment for such a big company to have such a bad service for a simple thing that could be sent on email in 5 seconds "wow"