You can safely ignore Trace and any other debt collector. They are powerless to do anything. Never, ever try and communicate with a useless debt collector.
It is far too late to try and appeal anything now. What you are waiting to see is if Alliance Parking decide to try and initiate litigation to try and recover the alleged debt.
There is no debt unless a judge says so, so don't feel as though you are indebted to them, you aren't.
So, ignore all debt collector letters. If/when you receive a Letter of Claim (LoC) either from Alliance themselves or one of a number of bulk litigators, come back and show us.
Anything that only gives you 14 days to pay is a debt collection letter. An LoC will give you 30 days to pay.