Wavy Paint. Now What?

Just had my 70 Challenger bodyworked and painted. I went to go see it today even though it wasn't completely done. "Still needs final buff." The bodywork looks good but the paint looks really wavy. I'm seeing it on parts of the car that I know had no bodywork done. What caused this, and what should i say about it? They were acting weird about it. They have been letting it sit outside in the sun to "let it shrink." I mentioned the wavy look and they said to wait until the final product.

BTW...

Wavy Paint. Now What?
Author: Old B5