Posting here will not prevent orders from being shipped. Your seller will not see your message.
If there are orders in your Purchase History on eBay that you did not make, see here:
https://www.ebay.com/help/account/protecting-account/get-help-hacked-account?id=4196
eBay can only help with purchases made using your own account.
If transactions appear on a credit card statement but not in your eBay account, contact your credit card issuer directly for more details about those transactions or to dispute them and get a new card issued.
