Sounds as if you paid as a guest buyer, if so then you can still open a dispute but you have to call customer services and they will do it for you.
Click on the words "Contact us" at the bottom of paypal pages > click on the "call us" option on the left (fees "may" apply so check the cost with your phone tariff first, as you sometimes have to wait a while to connect).
When you get through don't select any options just hang on till you get transfered to an agent.
Advice is voluntary.
Kudos / Solution appreciated.
