Use it physically at a store and ask them to charge the rest of the balance to cash or another CC. Just like you'd do with a gift card since they are called Pre Paid Visa "GIFT CARDS".
That really sucks, I've heard of it happening before to a lot of other people, in fact one of my friends had something like $40 taken from him when PP banned his account (luckily he didn't link his bank info to PP or his account probably would have been drained). I believe it may be too late now however there was a class action lawsuit being launched against PP, likely it has already passed since I heard about this in Gr. 10 so that would have been like 4 years ago.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE