As I started down the SI rabbit hole a few years back, I did some research and came upon these guys:
https://www.leftseat.com/
THEY SUCK. And the suck hard. Send me your money instead. It sounds like you’ve been waiting around for nothing, that’s all you’ll do with PMS.
Once I switched over to AOPA’s PPS, the nightmare was over inside of 2 weeks. They’re bulldogs in calling OKC on your status, collecting the proper paperwork, etc. They’ve got connections in Oak City to make stuff happen.
I can’t recommend them enough. Believe me, I know what you’re going through.
Hope this helps.