That's a shame John, but I'm with Pops on this.
There are good technicians, and there are good business operators...........not too often do they occupy the same body. These guys probably take a decent size deposit to start a job, which means they get faster cash flow by taking in new work than completing "old" work. Ken Fenical, who owns Posies, has a statement on his website something to the effect, "If a shop asks for a deposit to start work they can't afford to be in business!". While I can think of some exceptions to that "rule" it's generally accurate in it's intent. I consulted with a rod shop operator a few years ago who operated similarly to your guys. He did great work, but when I surveyed his previous customers nearly all of them said they wouldn't do work with him again because of the grief he caused them. At the root it could be attributed to poor communication, but the shop owner kept dilluding himself that the customers just didn't understand...............he had a business to run! He never got the concept that treating people badly doesn't help running his business.

The next issue could be finding someone willing to takeover the project. I hated it when someone brought something like that in. The first work I do on any part of the job I own the whole thing in the customer's eyes. Make sure for your sanity, and that of the new shop, that all potential issues are noted BEFORE work begins. If the new shop doesn't do a thorough inspection and discussion with you about things they see that might need redoing or revising you could be in for more grief, and greater expense, down the road.