All Rental Cars companies out of stock - Avis Bailing on Prepaid Booking with status

Have a cruise with 9 close friends on April 5th.

We booked a 15 seater passenger van back in January for a 1 way rental to miami from Georgia through Avis and prepaid as a presidents club member.

They called today, 3 days prior to reservation, to inform me the passenger van is not available and made it sound like they are out of stock for all vehicle classes in the message. They didn’t answer when I returned their call directly and left me with the general customer service number to call back.

I called the dedicated service line and was told all they can do is refund with no penalty or try to show up day of and be given whatever they have available (if anything).

Am I just SOL?

Nothing nearby has one way rentals and the airport has very few vehicles available for same location return.

I know the government shutdown and airline uncertainty really messed up the rental car availability, but I chose to rent with Avis because of my status and feel very disappointed at this situation.