I got a letter from a contractor we have been in a dispute with saying he is claiming a lien. We didn't pay him for his services because he didn't complete his service, and ended up doing damage to our yard. His lien he sent a certified letter on is for 125$, the original amount was 75$. We have emails, texts, photos, and witnesses that can prove the job was not completed. Should we send a Notice of Contest to him, or is there some other method of dispute we could use?