"not a factory exhaust" is a very lame excuse. If that was an issue, then they should have refused to service the car in the first place. They accepted the job, they drove it into the bay and they drove it out when the damage occurred. Yes, I very much think this deserves a letter and/or phone call to corporate hq.
All that being said, I use Jiffy Lube (Leesburg) and will continue to do so, although I am disappointed by the way they treated you.
