ACCOUNT PAID UP BUT IM STILL BLACK LISTED

It is so disappointing that once companies like MTN get money from you, they don't care about anything else. I was handed over to debt collectors called VVM Debt Collectors in 2014 for a MTN contract account which I settled in full (R7,431.81) . I settled this account on the 28th April 2015 and the debt collectors sent me a letter confirming I've settled. but MTN DID NOT CLEAR MY NAME WITH TRANS UNION!!!! I am busy with a bond application now and this has surfaced all because of how incompetant MTN is. it was your responsibility as a company to make sure that my name is cleared after I settled what I owed, now my bong application is delaying because of you...I tried to even call MTN to sort this matter out but I was placed on hold for 20 minutes which is a clear indication of bad customer services and being inconsiderate. I am extremely disappointed and my progress is delaying because of MTN.