Best Tank Less Water Heaters in Dallas TX

Non licensed company

Hung me out to dry.Full valve replacement on a shower.They didn't follow instructions for flushing and debris ruined the new cartridge in a day (I took it out and found copper bits, Teflon tape, and solder in the valve but cleaning it up didn't fix the damage).Now for hours they won't pick up the phone (during their business hours) and when I got hold of the tech he takes zero responsibility and gives me no guarantee about when I can talk to someone who will.Meanwhile I have to turn water off to the whole house so the shower doesn't run constantly while I wait or pay an arm and a leg for another plumber to fix what they broke.EDIT: Talked to them on Monday and the woman I talked to very flippantly says oh we're not open on Saturday, when I mention that their Google listing shows hours Saturday, she (again totally flippantly) says oh, well Google is wrong (I submitted an edit here since they apparently can't be bothered to). During further conversation, her attitude when I described the impact of their failures was unapologetic and unconcerned.So expect that these guys probably won't, but certainly might make the kinds of mistakes a DIYer would make and if they do, will not have much concern at all about the impact those mistakes have on your life.EDIT2: Raising to 2 stars because they did get back to me and at refunded the cartridge I had to buy, so I'm giving them some credit. Obviously it was not nearly enough to make up for the hassle they caused me by failing to do a careful job in the first place, but it's at least some representation of willingness to take responsibility.