That's a tough one. If we screw up, we pay for shipping (or give store credit for the amount the customer paid to ship back to us, is usually easiest). To the best of their knowledge, the retailer probably thinks this was the correct product and all they have is your word. Have you purchased much from them? Customer relationships develop with time, and you'll find they're much more accommodating if they recognize your name.
Founder of Capital Airsoft in Edmonton
Out of the Game 04/22/16