Best Existing Gas Line Repairs in Dallas TX

TL;DR Joe kept 3400 dollars for a job he never did. Said he'd pay me back, sans the hours he put in trying to diagnose my problem/messing with my pipes, and now seems to be ghosting me.Had a flood in a bathroom from the base of the toilet. Joe looked at it, figured we had a slab leak. Asked for a 3400 dollar down payment to deal with it by tunneling under the house. We saw his reviews and trusted him, and paid him.He kept showing up hours later than he said he'd be, and a flushed toilet caused another flood, leading us to doubt his diagnosis. He was gonna deal with the clog, but he still believed their was a slab leak.He said he'd come deal with it at 7. My girlfriend got up early to let him in; he showed up at 9 but had to leave almost right away because he didn't have the right equipment or he needed to drive his girlfriend to work.Last straw for us. We told him we were just gonna hire a big corporate plumber to get it over with fast. He was polite, said he'd pay us back the down payment.We called in another plumber, they showed up, used a camera snake to find the clog, demolished it, and were gone within one hour. 600 bucks. They said they found no sign of a slab leak.Joe suddenly got real hard to get ahold of. He hasn't replied to a text or call in... 4 or 5 days now? Been over a week since we let him go.Last time we talked, and I told him I was freaked about the chance of him walking with my money, he said I'm not that guy.I honestly don't get it. I'm starting to wonder if he ever honestly believed there was a slab leak, or if he just thought we looked like a couple gullible idiots. I guess he was right, if so.