If your card is not working you can request a new one through the card section in your BLING app.
To do this, you must first tap on the “More” button, and then select 'Cancel card' to deactivate your current card.
Once this step is completed, you can simply go to the 'Card' section to order a new card.
You can find more information in the article: How can I order my BLING card?