Tat plumbing

He gave me a 2 year warranty about his job- replacing bathroom shower cartilage and I trusted him so paid in full but 2 weeks after it's leaking again. He gave me wrong parts and broke the handle and charged me. He switched hot water and cold water, didn't even screw the handle so it's loose and falls off easily. I asked him to come and check but he refused. He didn't hold on his own words of 2 year warranty. Shame. It's a simple job. Many guys said they fixed it themselves He's plumber and can't do this simple job properly?! He said I am Persian. You can trust Persians.
Well, he spat on his own face. What a shame. Really DISHONEST.
I think we need to regulate more tightly so