Even if a return is not allowed, exchanging for a comparably priced item should not be an issue. If part of the value of the shop is the merchandise, there is no reason for you to lose the value because it was defective.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.