What do we do if my husband received a DUI, never received information about an arraignment, and now he has a bench warrant fine $750?

My husband received a DUI 12/30/15. I continually called the local police department as directed (for 3 weeks) and they never had any information. I physically went down to the police station and still they had no information 4 weeks later. On 2/2/16 we received a notice for a ticket with no proof of insurance from the local police department that I had been calling. I went to the station to try to resolve the ticket and they tell me he has a bench warrant out for his arrest. They said he has to turn himself in and may face a $750 fine for failure to appear. We have never received any notification. I went back to the police department and they told me that there was no actual arrangement date and that this is how they do things. They just issue a bench warrant. If I would have never went to resolve the ticket, we would have never known that he had a bench warrant. This sound like a way to collect more fines. Is this legal to do this? We do not know what to do next.