I went through this for months...Transunion (and the other 2) said it was only the credit card co. that could take it off and the credit card co. said only the credit reporting agency could take it off. I bombarded them both with non-responsibility letters and disputes and they FINALLY took it off! What really makes me mad is that HIS collection agencies got a copy of my credit report that will remain on there for 2 years and they could legitimately do it! (That first year was H***)!
Good luck...it's a real pain.