This happened to me when I ordered a cheap stick for my sister Celly 1.1.. I figured cheap ram would be ok. Ordered a no name stick from a random website that had it cheapest, and it didnt' work.

After returning it, I got a credit for 15% less than what I paid. Not a restocking charge, but the "fair market price" - which was in their terms and conditions.
Bottom line, read before you buy. If you don't, it's your fault.