Automotive Shop Seized My Engine.

I have a 2016 tundra 270km bought it from a mechanic who builds and tunes racing bikes for fun and owns a house building business very smart guy, took very good care of the truck everything ran great. I left it at my parents house because my business is seasonal and it’s winter here in canada. My dad moved it around a few times never drove it anywhere since it’s not insured, also let it run for 5-10 minutes each time so the battery stayed juiced and wouldn’t die. Fast forward to 2 weeks ago, he ran it and didn’t realize it was very low on gas, came back to it not running because it was out of gas. Put some more gas in tried to run it but wouldn’t start, it needed the fuel lines to be reprimed. I arrived that day so I was there to inspect before it got towed off, also we have a lift in our garage and we are both car guys with less mechanic knowledge and more body work knowledge. Had the truck towed to a shop and it sat there for 7 days before they touched it. They called my dad and said they got it running but forgot to check the oil and it had no oil so now the engine was seized. I have no idea how it leaked because we would’ve noticed it has a leak plus I checked the oil before it got towed off and there was oil. So it must have somehow leaked while waiting in the shop. But the point is that they didn’t check the oil which is standard procedure with any engine issue, and because of that the engine is now seized and looking at a new one is worth half the truck around $13,000-$15,000 including labour. My dad has been going to this shop for the last 15 years, and I was too until a year ago when I brought a 2013 Subaru wrx in and for no reason this one guy let’s call him David deleted an ecu tune which costs around $1000. Now when I called to ask them to walk me through what happened with this truck one of the owners(2 owners total) said that David worked on this truck not him so he would have him call me back since he was on lunch break even though it was 4pm and they close at 5pm. So I have them my number and I never received a call back. That was Friday before they took the week off for holidays. I’m pretty sure every shop should have insurance for making a mistake like this but what if they choose to say no we won’t cover it. Any input would be greatly appreciated.

TDLR: truck ran out of gas while idiling needing the fuel lines to be reprimed sent it to a shop that we have been going to for 15 years. Truck sat there for a week before they touched it, they didn’t check the oil before starting it, somehow had zero oil in the truck and after starting it with no oil the engine is now seized, new engine will cost me 13-15k.