As others have stated there is no such thing as NO RETURNS. That Seller BS hasnt worked in probably 15 years now.
If I purchase something on EBAY and its defective/not as advertised etc I dont even bother contacting EBAY or Paypal. I go to my Credit Card company who has authority over EBAY/Paypal. I get my money credited IMMEDIATELY and dont have to wait 30 days or whatever for Paypal to make a decision. Always always always pay with a Credit Card and dont mess with the other 2 services if things go south. You'll save yourself a ton of headaches doing all your transactions this way. Sorry the OP's transaction didnt go well but thats the sandbox you're playing in. Sell elsewhere if you dont like the rules