Not for a full refund if the goods are of diminished value. I'd assume you've opened it and tried it. You've diminished the value. As you say, it's not a try before you buy. The fact that it is broken though gives you rights to a full refund with no deductions, and in fact, any real impact on you. Just provide basic proof of the fault and everyone moves on. Alternatively, let your piss boil, refuse to take a 30 second video, post a rant online, then travel to the shop instead. I know what I'd do.