Hold your ground. You may have to escalate things to the next, and the next, person up the chain of command. Ultimately HD does want satisfied customers but as you can see it is a long game you’re playing with them. Since they dusted your house up with a Portland based cement floor patch you could play the silica dust card in your house and all your duct work and tell them that now you have to have a cleaning company come in with HEPA equipment and clean your ducts in addition to everything else since silica dust is a carcinogen. Every time they try to downplay you just have to turn it up to match their BS. It’s a game, play to win even though you ultimately lose.