illegal postage add by seller

a jewelry seller from India, they run $0.99 auctions for their items, they advertise NO POSTAGE on some items, if you win 3 items with NO POSTAGE on any items like I have, they will issue an invoice with a $39.99 POSTAGE CHARGE included. this is ILLEGAL by Ebay bylaws, i have sent several messages to correct this FALSE INVOICE, so far nothing in reply. If they follow their usual scam, they will soon cancel the transaction and cite that "client canceled" this is their way of skirting Ebay intervention. Ebay is useless because AI does not seem to understand what a scam is. the only way these, using the term loosely, people will learn is a BOYCOT of their company.