Is there anything that can be done to resolve the negative trust or is this the final judgement on this account?
There's strong evidence and might you have a slim chance to convince them.
Once @JollyGood said,
Correct me if I'm wrong, but I haven't see @JollyGood ever remove his feedback, it will always stand, the difference is the color he use.
I have removed and revised feedback on numerous occasions. I am not as strict or as stubborn as some might make me out to be 
On several occasions I gave completely incorrect feedback and removed/revised it. On some occasions I revised the feedback after the member posted and contributed positively regularly over a period of time.You may try it in your case which we know is the only way to rig the negative tag or revise into a neutral if you're a lucky one.