Vinyl fooring

The owner Martin , quoted verbally on vinyl flooring for my new house, and I accepted. Did the installation, and gave an account to my builder for 10% higher than quote. Builder paid him. When I asked Martin about the difference, he promised to look into it, but he was very busy. 2 months later and many many letters and calls, and I still cannot get him to give a satisfactory explanation. Just promises to get back to me. This is the only sub-contractor from my building experience I will not recommend anybody to use. A promise should be kept. I just hope I dont have issues with the vinyl later on, as I assume the guarantee will also mean absolutely nothing. There are many reliable alternatives for this service. Pity, he looked like an honest guy.