You're seeing this warning because your account has become restricted. This usually happens because of a payment failure which can occur for numerous reasons.
To return your account to active status, you'll need to pay the balance on your account. This might require you updating your credit card to an active card, or making a direct payment with a new card.
If you have any questions about your account billing or payment, please get in touch with our accounts team at firstname.lastname@example.org or call on 1300 284 736