If you're having trouble getting waited on in ANY place of business, take your cell phone and call them. Ask if they're busy, if they say no then say "well how about some help here? See the guy at the counter waving at you, with the phone to his ear? That's me". It'll make an impression.

I had to do that at Rocky Mountain Harley Davidson once, and I've never been back. You want to get treated like something smelly on the ground? Go to a Harley Dealership. Any of 'em, anywhere. Pompous assholes, all of 'em.

Had to do the same thing once in Shepler's, looking for a pair of jeans.