I have certainly had to go hunting for contact info in various search engines when trying to help some users. I have previously had no luck in finding Classic Reels info online.
Regardless, looks like Classic Reels added a new box in their Channel/app (or I had missed it previously) situated amongst its content in upper left corner. (basically first box if you hover over).
It directs users to call 408-556-9391 for any Billing Adjustments of Questions. This is basically Roku's own contact information. (https://www.roku.com/about/contact), where you can then choose the appropriate option.
Maybe they can provide more info as to any additional support.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102