If you submit the request for the refund or cancellation charges and haven't received the amount then you should just call roku customer support phone number +1 (888)-277-0610 and share your query with them. As soon as we receive your request we will review your query and get back to you with the solution.
For more info:
Phone No: +1-888-277-0610
Add: 2101 City West Blvd, Houston Texas 77042