Your money has moved off your closed card and is now in your account.
To see your money please go to the "Account balance" section of your account page on the website. You'll see any money you had on your old cards there. This isn't currently viewable on the mobile app.
You can use the money on your account balance to add money to a Currency Card or make an international payment.
To do this, hover your mouse over the dots at the top left of the icon displaying the currency balance you want to use and select the option you want.