Deffo take the camera for an exchange, tell them you've had it 2 weeks-ish, be vague they won't know because you don't have receipt and you only want exchange for same thing.
For bikini, does it still have the gusset sticker in? Taking that out is usually the deal-breaker with undies. You can usually take stuff back to shop from catalogue can't you, and I'm sure they repackage every time cos you never see badly packed stuff coming through your door. Again, most likely to win with an exchange but if u have the paperwork it shouldn't matter xx