How much does the PDM class pay? How do they officially notify you when you have it?

I got a call in November that my December PDM class was cancelled (didn't even know I had it) and that they were going to pay protect me for it (I think she said 4 hrs). Fast forward to January bid, I receive an email telling my my PDM classroom has changed ( for January 6th), I don't see it on my line so I decide to bid around it anyway. Bid results come out & there is the PDM on my line. Get email from ALPA asking if they notified me so I said yes & no...now it's not on my line anymore. I'm going to ask for yet another month of pay protection since I did bid around the stupid thing. Anyone else having issues with this?