I was unsatisfied with work done on my car so i went to the lot and took my car back. now they are calling me threating to file a suite.
Lawsuit / Dispute Attorney
You cannot just take your car back without paying because you decide you are unsatisfied. The mechanic is legally entitled to the fair value of the work performed. Negotiate a deal so that both of you are satisfied.
Fighting about this in court, which lawsuit the mechanic can pursue against you, will cost you both more in court costs and legal fees than the car repairs most likely.