When was this extra fees charged? While you paid through Paypal? Is the seller member of the GSP (Global Shipping Program)
If yes, all these fees were on the item description page. Read carefully before buying.
If the seller added an amount after winning/buying the item, that's incorrect (if shipping fees for your region were already given).
If you were charged 18,95$ from Canada Post when you got your item, this is not fraud from ebay or the Seller, it's from CBSA (Canadian Border Services Agency), all details here : http://www.cbsa-asfc.gc.ca/import/postal-postale/duty-droits-eng.html