Poor work, and won't even pick up the phone to call the customer

Bitumproof did a waterproofing job on my shower in December 2012. They had to come back to finish the job in 2013 because their tiler damaged tiles and my shower door. When I still had water damage I called them the same year under their guarantee. They told me the issue wasn’t caused by their job but was from my neighbour. So they just patched up the damp side of the wall saying it will stop the water from coming through from the neighbour. The issue came back, I kept blaming my neighbour because I assumed that Bitumproof were experts and couldn't be wrong. This year water broke through the wall and I could see plainly that it was the wall Bitumproof had done their original work on. I called BItumproof again. Their employee who was new to the company told me that if waterproofing was done right this should not have happened. I asked that the owner call me so we could find a way forward. He did not bother to. Instead he sent me an email saying Im out of the guarantee and if I want I should call him. I therefore do not recommend doing business with this company.