MTN massive billing mistakes due to incompetence

I transferred my account to my father, MTN never billed his account, but continue billing my account - I was unaware, due to the fact that I was overseas for almost 3 years. After some time being overseas, I received an email from MTN stating that I need to settle my account or they will take me to court, then immediately we sorted the issue out. We queried why this was happing and found the mistake (on their side - which they admit). After we settled the debt MTN continued and sent my details to Transunion. FOR NO REASON! As the debt was settled, additionally it was their mistake from the start. The incompetency of their employees lead to this. I recommend you move to another provider before this happens to you as well! I am a highly skilled working professional with this stain on my name which is really hard to get rid of (while I am not at fault). It is unacceptable that big corporations put *********** people in place which could cause so much personal damage.