I am very new to the REI. I bout my first Multi family this in July this year. So currently I am remodeling my unit starting from garden unit for me to live in, as i'm house hacking.

I hired a contractor recommended by my RE agent. This contractor seems really promising so I hired him. I made a mistake and did not make him sign contract. I gave $6K  when demo started for HVAC installation. Demo and HVAC installation took almost >2 months finally. Now the contractor does one thing in 1-2 weeks then disappear. His typical answers when we get frustrated " yes I am coming tomorrow and finish all those" so she shows up and do one thing again. for almost 4 months nothing done, nothing just HVAC install by different compony.  All the demo he did coast probably ~3k the highest. What shall I do. I know I am screwed. And I know he is not going to finish in probably any time soon or maybe none. this is the most heart aching thing I ever encountered.