Thank you to everyone on here who shared your knowledge, experience and provided advice. Unfortunately, I did have to cut my losses and let this contractor go, and now I am out a few thousand for what I put done as a deposit, but I’d rather it be done right and pay more than to have a mess a few years from now. I tried multiple attempts to discuss my concerns and they would refused to correct anything until I mentioned terminating the relationship, then they were willing to rip it out and start over. I just wasn’t comfortable with them doing anymore work on my shower, so I have moved on and hired another contractor. I am glad this site exists and I hope no one else has to go through this, it was very stressful!