You can't do anything sadly. If whoever left you the negative trust is not responding then you will have to live with it.
It's really very sad not to have a second chance ... I'm very upset 
Well, no one said you couldn't get a second chance, but the only person that can give you that second chance is the person who gave you the negative trust.
What did you do? I haven't seen it written here, but maybe I missed it.
People abuse trust here like it's a drug. It's disgusting. Be careful with anyone that you deal with, a lot of people use negative trust as a weapon for the silliest of shit.