MTN HAS LISTED MY ACCOUNT TWICE

I was listed with my Mtn account at two debt collecting companies. I have been paying this account at MBD INC since March this year an amount of R300. Recently I receive sms's from SSDA that my Mtn account has been handed over for an amount of R 5774.33. This is reflecting on my ITC negatively, I really don't understand why I am listed twice for one account by MTN. I need this matter rectified as soon as possible. I am very upset and disappointed with the level of service at MTN. My account at MBD INC is almost paid up. So I need MTN to remove my profile from SSDA.