I just finished reading through yours, the best thing to do is get a lawyer involved and keep putting pressure on the shop.
It's going to be getting an amored ignition, looking into how much a LoJack system willl cost me through work, multiple kill switches. It was an easy target for the bastids who stole her compared to the other vehicle in the apartment complex I live in, the sound system that was in it is chaep in comparison to others here. No alarm or other security system made it easy for them the worn out ignition cylinder had it much easier for them too.