Need advice on dealing with contractor

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Need Advice...I hired a contractor to do a basement renovation and it was supposed to have been done in 6-7 weeks. It is now week 18 and the work is still not done. He is dragging his feet and not putting in any effort to finish the job. I have made every single payment on time have tried talking to him, have been very open and understanding about things that have come up but at this point, I feel like I am being taken advantage of. Not only that, the HVAC work that was done by him has caused serious persistent issues to my existing system and at this point it has stopped working even after I spent extra money in trying to fix it. Any advice on how to proceed would be much appreciated! TIA