That is the problem with ordering outside the EU. Unless they guarantee to refund customs duty you can get caught! So even stating only per centage does get caught really means nothing.
With PayPal you have to put a claim within 30 days outside that they will do nothing.
It is an expensive lesson unfortunately. I got caught once long ago and learnt the hard way.
With paypal and ebay, the best bet is to open a case sooner rather than later for items that you haven't received. Once a few weeks go by, it's pretty safe to assume that there is an issue. I've learned this the hard way as well, in trying to give the seller the benefit of the doubt, and in the end it just isn't worth it.