The police have a responsibility to take a report in this case. If they initially failed to do so, go to the police station and demand one be filled out. If you have the responding officers' information, ask (or demand) that they make a statement.
Especially if witnesses are available, a charge of assault against the driver may be appropriate. The fellow made threats against your husband with intent to terrify, which qualifies as assault at least under common law. Obviously this is more challenging without witnesses at hand.
If none of those work, there's always dragging the fellow's name through the mud. If the details here are correct, he certainly deserves it. According to Google, he's a business owner, and a business owner's reputation is very important. If his behavior doesn't warrant a good reputation, he ought be brought down a few notches-- protests near his store might do well.