Very poor after-service KD Plumbing

I'm really disappointed with KD Plumbing. A leak which apparently was fixed is wet in the exact same spot after spending almost 5k. When I called them to ask if their work is guaranteed as the exact same spot is wet again...they said its a different leak and I have old pipes. When I asked them why the leak detection of my whole house - that I paid for - didn't pick up the "other leak"...they said there were no other leaks found at that time. When I asked them why... if they noticed that there was a problem with my "old pipes" why they did not inform me when the wall was already open and they could have done something. They gave no response. They did not even offer to come and look and open it free of charge to see what was wrong. I have to pay again for everything. No, man. This is not okay.