In my state you have to give the contractor 1 chance to fix things before you can fire them. Here's what you do. By EMAIL (nothing verbal), tell the contractor that the work is not even close to being installed in an acceptable, professional manner, that it is clearly not up to industry standards. Ask them to fix all the problems (make a list). Ask for him to answer you by email by xx date with his plan for fixing things.

After he tries to fix it and fails to do so (or he refuses), you have given him the 1 chance to fix and you can fire him. If he refuses to fix, it still counts as the chance to fix and by refusing, he is quitting instead of you firing him.

If he does attempt to fix, don't be alone in the house with him. Have a friend, spouse, neighbor or someone else with you and don't let him position himself between you and the door the whole time he's there. Be near the door in case he threatens you. Have your phone on you at all times.

After he either fails to fix or refuses to fix, send him a demand letter (and also send a copy of the letter by email) saying something like "because of your poor and unacceptable quality of work, and because you were not able to fix the problems (or because you quit), I now have to hire a new contractor to demo what you have done and start the project over. Because of this, I demand a full refund of $xxx that I have already paid your company, plus $xxx for the replacement of all the ruined tile and other materials that I will now have to buy again. Please deliver the certified check or money order for $xxx to my house by the end of the week."

It's very important that you document that you gave a chance to fix, and then he failed to do it properly, again, or else he can sue you claiming that you didn't give him a chance to fix it and fired him illegally. Also, if he refuses to fix, he is effectively quitting. But in order to protect yourself you would want to document that (IN EMAIL) saying something like "After asking you to fix the problems, I never heard from you. Please confirm you received my email asking you to fix things." Then a couple days later "Since I am not hearing form you, does that mean you are quitting the project rather than attempting to fix the problems?" Document all responses by email. If he calls you, do not answer. Instead send him an text right away saying "Sorry I missed your call. I'm, in a very loud place and can't talk easily. Please read the emails I sent you recently and respond that way."

Keep your doors locked and do not answer the door if he shows up at your house. I had to call the cops once when a "contractor" who had never even worked here and I didn't know, showed up at my house demanding I pay him for phantom work he said he did at my house. I never saw this person in my life. He refused to leave, was banging on the door, so I called the cops.

If you don't get a refund, at least you will have documented everything so that just in case he does sue you for firing him illegally, you will have the proof in email that he either 1) tried to fix and failed again, or 2) never ever answered you and just ghosted you which is the same as quitting; or 3) quit explicitly.