Experian SA..Nimble...Mtn

I have been listed on Experian for a MTN account....after months of trying to clear my name Mtn send me a paid up letter and my name was cleared. The all of a sudden a outstanding Nimble account gets listed.. Mtn sold this paid up dept to Nimble.. and they listed me again! I have send 18 requests to get it rectified. Experian send me a letter stating the issue has been resolved in my favour and my name will be clearde.. its been 3 months 9 e-mails and I am still listed! It now even shows on my FNB account!