Diner Dash Hometown Hero

I am at a point I cannot get past at the moment and I am not sure I ever will. I have looked for tips and cheats on the web and have yet to find any at all for this specific game that have helped any. The problem I am having is in the Disco on the third level. The most points I have gotten is somewhere in the range of 18000 and 21000. I am not sure how to get more without losing a heck of a lot of customers. I have only gone through once without losing a single customer.

Someone please help me!