you are communicating with an Expert from JUSTANSWER.COM an Independent paid question and answer website.
What I could suggest you do is, contact eBay click here https://www.ebay.com/help/home
Once scroll down the page then click Contact us.
There are some options you can do to resolve this situation. You can either go to their website, sign in your account,
and in your orders see if you have the ability to change the order.
If you are unable to do so, you may need to then contact their customer support. Once there,
you can explain them the situation and ask them to change the order, keep the order the same, or to receive a refund.
If they refuse, I suggest You will have to contact your bank or credit card company,
let them know that the payment is unauthorized to be processed and that they need to cancel the payment.
Tell your bank to dispute the payment
which may result in a chargeback, in other words, the transaction would be put on hold and disputed with the merchant.