Unfortunately, VM offer customers no proper online account management capability, so your only option is to try phoning in. When you've cancelled the booster they should send you a returns package - make sure you get proof of despatch when you send it back.
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Welcome to the community and thanks for your post.
Unfortunately we cannot make any account or package changes over the forums, please could you call into the team on 0345 454 1111 or send a text message to us on 0753 305 1809 and we can get this looked into further for you.