We received a fake check, how do I go about getting this person in throuble?

My husband & I received our security deposit back in the form of a check. When I meet up with my husband I see the check is 1) not a personal or cashiers check it is a check from his step fathers auto mechanic shop, its his step fathers boss check! (that part we find out at the bank) and 2) our ex land lord made the check out to cash! I told my husband that we would have an issue and he said yea maybe but lets try anyway, so we go to Capital One to cash it and we explain the situation......the clerk calls the owner of the check and he said "I haven't wrote a check out in several months" and so we finally get our ex land lord on the phone and he explains while we are still at the bank that it is his step fathers boss check and the clerk says "that is check fraud" and explained to us both that he would have to call the cops, immediately me and my husband are explaining again even more thorough that we had no idea. I called the police station near us and the guy was a sarcastic pompous ***. I have emailed the land lord so I have a paper trail and he says that he will pay, he calls me later on in the day and says come Saturday, we go and no answer, we email 2xs again and no answer. I am trying to go about this right way and the police are taking this lightly. Not only does he owe us money, he wrote a bad check that could have gotten us in trouble. What should I do from A-Z please and thank you.