Dragoon, I had the same exact problem. I went to a local pet store, they were out of adult mice, so I asked them to order me 10 and they asked me to pay ahead of time since they had problems with people bailing out on orders. Big mistake.

I go a few days later to pick them up and the guy hands me a bag of hoppers. I said "Oh there must have been a mistake I ordered adults, not hoppers." and he says "These are adults." I was so mad, they said no money back, no replacements, nothing.

The worst part is when I said "Do you care that you are losing a customer because of this?" the guy says "We don't make money on the mice anyways. Have a nice day"