Thanks for your post and apologies to hear that you are having an issue with this.
I'm sorry to hear that you were charged for your booster.
We'll need to take a look at this for you in more detail. In order to do that I will need to confirm some information with you.
I have sent you a private message regarding this and will investigate further once I receive your reply. Just click on the little plum envelope at the top right hand side of the page to access your inbox.