As you already know, the campaign was already not sustainable to run for the another period. I'm not quite sure that the owners might agree to paying for something(double the amount) for something that was clearly not their fault.
Lastly, I'm only acting as the person who manages the details of the campaign, post counts, users who should be accepted etc. The payments was escrow's responsibility.
THEY (or you) trusted the escrow. It is THEIR problem when the escrow fucks them over.
I dont see any reason to get this over with on the backs of the users in the campaign.
Sustanable or not, get out with a clean record.