Mtn has still not responded

i had a contract with Mtn and it went in arrears but i arranged to pay for it and finished paying for it and got a paid up letter in February 2015,when i viewed my credit report it said the account was handed over in march which does not make sense as i got the letter in February,i called the call center and the guy who i was talking to told me to just ignore it as the account shows 0 from his side,i told him i cannot ignore it as this is affecting my credit report ,and he said he will log in a query and they will get back to me in 2 to 3 working days,it has been a month now and i still haven't heard anything from MTN ,and i also don't understand why the account is still open from their if i finished paying it off,i deserve answers and my account and be updated,as im now seating on a handed over account which i fully paid .