Can you not ask your money back, if you have the reciept and a good reason i don't see why they won't give you your money back.
Don't know how much you paid for it but if it is +1000 dollari would'nt take it laying down but i've a bit of a short stop :angery:. and looking at the details of your story it seems you're a bit more patient

Have you tried resetting cmos, did they check memory compatibility.