You cant spoof a Mac address
That's not true.
, they are hard coded into the chips on the nic.
That is true, but that only supplies the default value.
I would call the company and give them the new Mac
Yep, I believe that's the best solution. Search here for MACADDR if you want a more difficult solution.
Also, please don't post the same message to multiple forums. It just wastes people's time.