Repair shop owner breaks engine says not his problem.

Good morning,
I want to state that I know next to nothing about Diesel engines. I admire the knowledge and expertise all of you have. please forgive any terminology errors. I’ll do my best to be accurate and fair.
I own a 2008 dodge sprinter 3500 with a v6 Mercedes drive train. I brought my truck into a shop in derby Kansas called Automasters because I was getting a glow plug error light. I told the man at the desk that I’d recently purchased the truck and to be proactive I’d like all the glow plugs switched out. He replied “no problem”. After receiving no call that my truck was ready, I called in. The mans response was, “ well we tried to replace your glow plugs but we couldn’t get them out and we broke one off flush with the head and we can’t fix it so we’re just going to give the truck back to you. Oh and no charge.” I now have zero working glow plugs because the control unit detects an open circuit due to the broken plug and will not power any of the others. I asked the man, “are you telling me that you mad my truck worse and that you’re not going to fix what you broke but rather just give it back and say it’s not your fault or problem? He said, “ it’s an old truck, other people have worked on it and it’s not our fault. You can take it to a diesel specialist in mulvane Kansas if you want.”
I do not like to yell and argue with people. I’m not that type. This did not seem fair, honest, ethical or kind. I was given zero warnings that the replacement of glow plugs is hazardous or was I told ahead of time that if they break anything not only will they take no responsibility but they also will not help you fix your new worsened state. I took it to the diesel shop they recommended and it has recently passed from father to son and the son has a lot to learn about professionalism, customer service, and business in general. He stated that they mainly do truck modification stuff but that he would look at it. $150 later he said “yep it’s broke, we can’t get it out and you’ll have to wait for the engine to blow it out.” Summer was beginning it was hit abs getting hotter I am a busy construction worker trying to feed my family I need my truck. Now that the weather is cooling off the truck doesn’t want to start because it had zero functioning glow plugs. I spoke with the owner who was confrontational and argumentative and he said “ not our problem but I’ll do the repair for you at cost you pay for the parts and pay $30 an hour labor and it’s a25 hour job.” So now I’m looking at a minimum of $750 plus parts and a repair by a shop that is pissed off. I paid a diesel professional $60 to come and look at the situation and show me exactly what was broken. He explained that the circuit was open and that the control unit was not powering any glow plugs and that as it gets colder it will get harder to start. He also explained that the repair, even at cost, could be as high as $2000.
gentlemen, I’m sick about this. Please tell me if this is how you would handle a customers engine. Please tell me if you think taking zero responsibility is acceptable. Please tell me how you would have handled this dilemma and how I should proceed. Thank you in advance.

 

Thank you for The idea that’s the same thing my new diesel mechanic suggested I think it’ll work well and I’ll just leave the broken glow plug as is I guess my main question is whether or not the shop breaking the glow plug should have any responsibility in this whole thing should they cover the cost of the work around or is it just common practice to break something and wash your hands of it I know as a contractor I would never break a customers water valve and then shut their main water off and walk away and tell them they’re gonna have to get a plumber so I just don’t see how they’re OK with that