When a Customer blocks their card (via their bank/provider), any attempted transactions on that payment method will automatically fail. Paypa Plane receives the response code from the bank/provider that the card itself is blocked, and no payments may be processed (which is reflected in the transaction state information when viewing a Customer's transaction).
A Customer may come to you and explain that they have since unblocked their card, but their payments are still failing. Once Paypa Plane receives a response code of blocked, the system identifies that particular payment method as unable to have anything further processed (to avoid continued attempts and accruing fees).
This must be manually unblocked. To do so, please contact Paypa Plane at email@example.com for one of our support team to assist.