Best Roofing Flat Roof in Phoenix AZ

We had a.tub to shower conversion which took two half days. Installation looked fine and the products used are nice. John the installer was polite and respectful. We were told not to use the shower for two days. On the second day when I wanted to use the shower, one of the doors won’t shut. It rolls open, will not stay closed. Called the office and Project Manager, Noah, with no response. Husband called and also no response. It has been a week since install.and I can’t use this shower. I have some disabilities and would like to use my shower. Customer service is zero. What good is a warranty when no one responds?