That's what I was afraid of...
Same thing happened to me when I was dealing with Apple Sales. They confirmed that they understood what I need and that they will order a space gray keyboard... but still they sent me a white one.
My advise:
1) return these products for a refund
2) start from scratch by going to chat as advised in this thread and do not let yourself to be transferred anywhere else. Also, read through this thread again and get the part numbers for the space gray products you need. If you will mention these part numbers to the Apple representatives in chat - it will help them to order the right items for you.
One thing that I find strange though, is that you paid through the link that they provided to you - this is what happens when your order a replacement part (same process for ordering the space gray accessories), so I had hopes it would work out for you... sorry to see it did not.
The ordering process has yet to complete. The next step after they receive the white KB and MM2 will be that it triggers Apple to then send the Space Gray KB and MM2 to me. This is how the "Service Transaction" works. So stay tuned as I sense all will be well in a weeks time.