Disgusting service from MTN

I HAVE HAD 2 MTN CELL PHONE ONE FOR ME AND ONE FOR MY DAUGHTER. FOR MANY YEARS WE UPGRAD MY DAUGHTER PHONE OVER A MONTH AGO WITH A SPECIALIST ON AN I PHONE. EVER ONCE IN A WHILE I Get A Purchase number then a few hours later a message saying there are papers missing when phoning they give you a norther number to phone or just leave you on hold.. I have spoken to the account department and no papers are needed they never phone or write back when they promise. I HAVE NEVER WRITTEN ON HELLOPETER AND HAVE NEVER BEEN GIVEN SUCH BAD SERVICE. MTN SHOULD BE ASHAMED