Up North Renovations

Jamal N was given $17,444 out of $25,000 to complete a renovation of a 2nd floor apartment. Jamal accepted the money and the only work done was some insulation was put up, and some drywall was placed (not all). The work was so poorly done, I had to pay someone else to complete the drywall. The entire floor was supposed to have been completed in 45 days, it's been over 4 months and less than 25% of the work has been completed. Jamal N flat out refused to give me a partial refund and refused to complete the drywall. I had to go out and find another contractor to finish the work, which costed me more in the end. He doesn't respond to any messages I send him about refunding me the money either. He's done barely $4000 worth of work but refuses to give me a refund. He's found the time to do other jobs elsewhere, but doesn't seem to have the time to complete the 3rd floor of the apartment building I fully paid him for either. I just want the 3rd floor finished (because he got paid in full) and a partial refund for the 2nd floor.