Hi @Wawaweewaa,
Thanks for your post.
If you've recently seen an outstanding balance of £35 in the app and have already made a payment, it may be that the amount you're seeing relates to your next bill that is currently being generated, rather than an unpaid bill.
However, as we're unable to view or verify account-specific billing information here on the Community, we can't confirm exactly what the charge relates to or whether a refund is due.
We'd recommend contacting our Customer Service Team via Live Chat so they can review your account and billing history in full: https://www.idmobile.co.uk/live-chat
They'll be able to explain the outstanding balance, confirm whether the payment has been allocated correctly, and advise if any refund is applicable.
We hope this gets cleared up for you soon.
Regards,
Gemma M
The iD Mobile Social Media Team