You’ll need to check your account and make a payment to bring your balance back under your limit. Once you’ve done that and the payment has cleared, you’ll be able to spend on your card again.
See the payment options available here for paying your bill.
We hope you find the email or text helpful, but if you want to change how you get it, or if you don’t want to get it at all, please let us know by sending us a message from the ‘Help’ section of the Barclaycard app or online servicing.