Hi, @hollybest.
Welcome and thank you for posting here in the Roku Community!
We understand that you paid for a Brit box subscription and still have commercials. No worries, we'll help you sort this out.
Please be informed that there are two subscription options available: one includes commercials, while the other does not. It is possible that your current subscription contains ads.
If you need assistance with the charge, you can reach out to our Account and Billing team. They will be more than happy to help you resolve the issue. To get in touch with them, please visit our Account and Billing Support page and select the "Account, payments & subscriptions" category. You should have the option to talk/chat/email with one of our live experts.
Let us know how it goes or if there's anything else we can do to further assist you.
Regards,
Reynan
Reynan L.
Roku Community Moderator