Smells like spoiled tuna.
You've been
INHO.
Just send a registered letter with all your correspondance printed to his address and send the other copys to the states attourneys office.
Tell him...that if this is not resolved within 7 days, a duplicate copy will be sent to the state attourneys office and the process servers office..and one to your legal staff.
Also allow him this 7 days for a written rebuttal..including all rebuttals to all correspondance over time.
That will get their attention.
I am working a 3 year old case now...going to be fun once it matures (nothing to do with cars or motors though)
Just do it, don't threaten. Let themj kinow you are doing it in 7 days...be fair..give them 14 and nail them.
Yea, it will cost you some to do it..but get your goods, or the money...to get out.
Be nice, professional and ruthless.