To challenge your council tax band through the Valuation Office Agency (VOA), you need to file an appeal directly with them. However, Rossendale Borough Council documents do not provide specific instructions or details on the appeal process or requirements for challenging a council tax band.
For more information, I recommend visiting the Valuation Office Agency's website for guidance on how to proceed with your challenge. If you need assistance with council tax discounts or other related issues, feel free to ask!