MTN - POOR SERVICE

I have tried to upgrade my daughter phone for the pasted month. Apparently the account was changed to a business account without my knowledge, and now NO ONE at MTN is able to unlock and allow me to upgrade her account. Rueban and his manager Mark from the Eastgate branch have been working hard at solving my issue but with not success. Every time they have logged a complaint and that complaint is followed up the system seems to thrown the case out and a new complaint has to be logged. Any suggestion as to what I should do, as this has been going on for a month now without any resolutions. I am ready to leave MTN after been with them for more than 20 years, # Frustrated customer