If they haven`t accept your apologize, try to accept the fact that you have a negative trust. If you dont really want to have a negative trust in your profile i think you should create a new account and try to start fresh and take your experience in having a negative trust as a lesson.
I can not agree with you. Not all cases are lost. If a user is able to prove his credibility I think he or she deserves a second chance in some cases. There should be many aspects taken into consideration like the history of that person, rank, post quality, etc. Like I said before everybody deserves a second chance but that's just my humble opinion.
Im just stating an incident that, when the final decision is to declined your apologize, try to accept it. Dont try to insist it when there has a final decision If you do that you may annoy the one who gave you a negative trust. But thank you for sharing your opinion i appreciated it.