[Fagottino89]

I would cancel and try to file it properly

I'm afraid to close it since I heard that after closing one dispute, I cannot open another one for the same transaction on PP.
Btw in my opinion I filed the dispute properly because PEB is same as item not received, I didn't see the point in filing this dispute as SNAD.
Anyway, does the reason matter? I had previously created a dispute for EB and I also checked "Item Not Received" when creating it, and within a few minutes the case was updated with the status of waiting for a response from the seller. Maybe there is simply a limit and they checked my transaction thoroughly so they decided to convert the dispute into a claim.

Yes, if you close this case you cannot open a new one. Imo at this stage you have nothing to lose, wait and see what happens, worst scenario you send the items back and try again