I have followed instructions to void a postage label that I created by accident (there is no warning that ‘creat postage label’ means paying for the postage). I have a message now saying that it can’t be voided, even though it hasn’t been used. I posted the item using a faster service at the request of the buyer. I’m worried that a) I’ve paid for it unnecessarily. B) tracking will show that it hasn’t been delivered so my funds won’t be released. What can I do about this?