First, this post doesn't belong on this board.
Secondly, you can write a complaint letter to the main office or any other place in the store system that you can find information on for customer service/complaint dept.
Thirdly, if it is only a customer service and not a monetary problem then you can't go to Better Business Bureau (BBB) with it. You can see if BBB will accept that type of complaint, etc.
Ok, I reread your post and am editing:
Go right to the top at the main office about this manager via writing and follow up.