Even dealing with point of sale and customer support issues becomes a lot easier when they know you're a few taps on your phone away from reversing a transaction. Make it clear that it's something you're very comfortable with, routine even, not a bother at all, and almost like you're doing them a favor by handling it on your end. They won't see it that way, of course, but it gives you all the leverage in the negotiation without it getting ugly.

Try it next time someone says their point of sale policy only lets them offer you store credit or an exchange. Say, oh that's fine, my credit card lets me reverse the transaction if I couldn't resolve the matter with the store, so I'll just do that. The very next response will be a miraculous change in the store's policy.