Alvin the supervisor was extremely rude!

Alvin the supervisor was extremely rude!
One of the Staple stores had messed up by giving me a Hard Disk of Laptop instead of PC (which i had originally picked up for purchase) by agent/human error. Despite the inconvenience it was understandable to me and it happens to the best of us as employees. I was directed to Staples in Vista Way since for an exchange, as i couldn't drive back to the original store. However, despite them acknowledging Staples error, the supervisor refused to honor the price and was not helpful, on the contrary, he was rude. I needed the product that day, but their unprofessional treatment cost me money and time. Utterly disappointed.