@Mintypeas I’m wondering whether the issue may be that the top up card (PAN) numbers might be incorrect on your app.
I’d recommend asking our Support Team if they can check the PAN numbers, and update them if they’re incorrect.
Lastly, you do also have the option of switching over to be a pay monthly customer, so you’d have a choice of tariffs, and would pay either by Direct Debit, or by card payment when the monthly bill is generated. This would mean you wouldn’t have to top up the meters, or worry about going off-supply. If this appeals to you, our Support Team could remotely change your smart meters over to be pay monthly. You’d then have access to a brand new online account and app, on which you can manage your Direct Debit, request a refund, check your usage breakdowns, view your bills, and more.
I’ve included a series of guides below that explain how everything works online, should you choose to go pay-monthly. Please let us know if you have any further questions.