Don't think you're liable?
You may also appeal if you consider that you are not liable to pay Council Tax, for example, because you are not the resident or owner, or because your property is exempt, or that The Vale of Glamorgan Council has made a mistake in calculating your bill. If you wish to appeal on these grounds you must first notify The Vale of Glamorgan Council in writing so that they have an opportunity to reconsider the case.
Making an appeal does not allow you to withhold payment of tax owing in the meantime.
If your appeal is successful, you may be entitled to a refund of any overpaid tax.