If they police don't respond to a complaint what's the next step to take.?

I know police officers have alot more to do than deal with petty neighbor complaints but when a neighbor crosses the line and won't respect others right to peace and quiet, What do you do when the police won't stop or even show up to address the violator.

Over the past 3 months I have called the desk sergeant not 911 to complain about the neighbors leaving their dog barking for hours and for blasting their stereo outside after 11:00 p.m. I have young kids that need sleep as do I and I pay too high of taxes to put up with this garbage. I've confronted the neighbors and they don't care and continue to do this at least twice a week. I've looked up the complaints on there address and nothing shows up. Nor does the activity stop even after 3 or more calls per incident. Who should I contact next? The way our houses face my front neighbors think it's my dog and music and I've had to bring them to my backyard to show it was behind me. At least 5 other families have complained as well.