Nothing I can do? I paid for cards with cash and have reciepts...

How does this cash work? Can you chargeback?

It's paypal 'my cash', basically it works like gift card, you can buy it at selected retailers (US only).

Quote

With PayPal My Cash Card, you don't need
a bank account or credit card to
send money to your PayPal account

So there's no bank involved, so you cannot charge back, but I reckon you still should be able to start dispute on paypal etc