OP - While FCRA does not extend to debit cards, some banks extend some of the same sorts of protections to some of their debit cards. It is worth checking with your bank to see if it can help on the dispute resolution front.
You are then left with a small claims action against PL. Don't threaten it if you aren't going to pursue it.
For others, Rule 1 is don't deal with the OTA's. Rule 2 is don't ever pay for a service to be rendered in the future, such as an air ticket or hotel room with anything other than a CC.