(I had a shower re-sealed by a company that gave a 5-year guarantee. Four years later it was leaking again, and I got in touch with them to have it redone under warranty. After stonewalling me for weeks, they finally came back with "we purchased this company off its original owner but didn't take on any of their obligations so you have to find the original owner and get them to repair your shower", and as far as I could tell that's actually a thing you can do.)