Hay in Richmond

I recently bought a apartment that contracted to them including plumbing system and Air Conditioning System. Unfortunately, ever since I moved in, the unit in my bedroom has been making knocking noise over 50db everyday and the situation gets worse during midnight and WHILE THE UNIT IS TURNED OFF. I have reported the problem to the developer and Broadway within first two weeks of moving in. And now almost 10 months has pass. They sent people to check it 4, 5 times and so far cannot determine the cause of noise.(Or not putting effort in this honour the warranty). While contacting their service manager, he refuse picking up calls and replying emails. I even recorded 70 hours of recording of noise, and made a simple log send it to them hope to help. However, Accountability obviously does not exist in this company. It has been 10 month now, I am not able to sleep in my bedroom because the noise at midnight is actually loud enough to wake me up. I would really give 0 star to this company if this is an option. Look else where for a company that's more responsible and taking customer care more seriously.