DO NOT DO BUSINESS WITH MTN! They ***** and mess up your name

I finished my contract with mtn last year august. Before paying my last payment i called in the callcentre they informed me what my last due amount is and when should i pay it, they also informed when to call in to change my number from contract to prepaid. Mind you ive had the worst couple of years dealing with bad service I thought i would never go back. This past week tried to go buy another iPhone but was told my account was sent to legal! Why? They dont know, on the system it shows i am up to date!! You messing up my name please remove me from the system