You have received 10+ negative feedbacks in the last 4+ years, but none were from a DT member. For me and most others, your profile is clean, and it shows 3+ green trust. So I think you have no reason to be upset about the fact that someone has left you negative feedback because this happens all the time in the forum.

The only thing that matters is that you don't have negative feedback from DT members, which means you didn't do anything wrong. Trust is not moderated, so the only way to remove it is to try to reach an agreement with the other party.