Appalling customer service

I reported a water leak in my house. ABSA appointed Brackenfell Plumbers to do leak detection. Brackenfell Plumbers came to our house, said they can not find any leak but that they think it may be the \bath trap"(pipes under the bath) and that this is not covered by ABSA Building Insurance. I then had to pay another plumbing company to break the wall and tiles in my bathroom to see if the bath trap pipes are leaking but they also could not find the leak and referred me back to the leak detectors. So I called Brackenfell Plumbers again and they said they can not do anything further before I re-open the case at ABSA (do they want to be paid again?). It has now been a month and the leak is still causing further damage to walls"