disputes of rep need to happen when the rep is given. I know you didn't see it til now, but you need to understand it becomes much harder for me to investigate the claim when it's not reported until 3 months later. I can't just start removing negatives without reason.
Right now I have no information about this dispute other than you traded an account to unnamed101, then a few months later he gave you a negative because he claims it was recalled. It might be true or not, I don't know, so I'm not going to remove it until I know.
I PMed you his email, he was active just 10 days ago, so there's still a good chance you'll be able to contact him.