I'm very lucky with my toy store. They have an unconditional 30 day return/refund guarantee on everything they sell. I'd be asking for my money back too!.
Knowing my luck, the mixer would fail on the 31st day! LOL!
I bought a set of lights from some Christmas deal at a store like Music 123 or Pro Audio Star ... decent price for a set of DMX LED "PAR" lights. They came in broken. Sent them back, and no more were available - ever. So got my money back. I really wanted the darn lights. That's my worst experience in online ordering (so far), so I can't complain too much.
Love working with local vendors, but they just don't have the newest toys in stock.