Originally Posted by TVT_DESIGN
The inside of the thermostat was removed. There is no reason to do this for anything at all. The thermostats on these car simply pop off with two screws and pop right back on. There is no need to remove the center piece. You can see where the mechanic had to pry it open with a tool to get it off, because it is not supposed to be removed.
None of this would have happened if you had shipped what was requested.
Selling someone a round peg for a square hole, and refusing a return because it was damaged while being forced into a square hole is bad business.
Your customer acted rationally by trying to get the thermostat to work. The details of how the part was damaged are irrelevant.