I'm working on getting the old or wrong addresses, etc. too. Transunion never sent me a full updated report, so I really don't know what they did! They claim to have made changes and showed 1. (my current) so, who knows.
But, I would just dispute it again and ask for validation of the source for the inaccurate info. Maybe even send it CM to show that you are serious about getting that stuff removed. Just a thought. I do think if you have past bills that have an old address, or maybe even employer info that it can show up again. Yet, I wouldn't think a creditor would have reason to verify or report an employer and really, can they? what if they don't know you changed employers, etc. I don't get that.
I think if you dispute AGAIN, ask for verification (I don't think they got it from a creditor personally) and demand DELETION.
Good luck.