Don't hang up on them; they're rated on how many calls they handle per hour. So by cutting the call short, you're improving they're rating.
Instead, talk to them for like a half hour: "Wait, where's the button you're talking about...I don't see any button...I go this thing here that looks like a little circle with a square inside...yeah, but I don't think that's a button...wait, there's a silver button here on the side, is that what you mean..."