Hi, I’m sorry to hear that. You can freeze your card in the app.
If you’re on iOS or have the latest update for the Android app, just go to the Card tab & tap the freeze button 
Once you’ve done that, you’ll see the option to order a replacement card.
If you’re going to be away for a while longer, the support team should be able to send you a replacement, if you message them via the in-app chat.