FALSE INFORMATION ON CREDIT REPORT

Last year, in spite of proof to the contrary, they listed me as arrears for three months in a row. They eventually fixed things on their side, like I said, I had all the necessary bank statements and they have all been mailed to RCS, they said the story was sorted.

NOW I find out it still shows on my credit record and this is affecting my ability to get the homeloan I want.

Last year I specifically asked if THEIR mistake will affect MY credit score. They said no and not to worry about it.

Can anyone advise me what is the next step I can take? I need this to be fixed one way or the other.