MTRX activation issue

[DHS]

Bought a MTRX to replace my HD I/O from a guy on reverb.
He said it was unregistered (I was skeptical because you have to register in order to get dad man rocking) but maybe he had more than one mtrx.
Anyway he didnt send a activation card. I reached out thinking this was no big issue and he has since gone silent. Without activation this thing is basically a brick as Im an s6 user. He wont respond to transfer of ownership request. He wont respond to text or emails. I have the unit and the serial but not sure if I can escalate this as a support case without some participation from him.
Anyone had experience?