You can certainly still open a dispute as a guest user but you have to contact customer services and they will open one for you.
When you get a refund it goes back automatically to the card you used to pay so it won't show in your paypal account.
Customer services.
Click on the words "Contact" at the bottom of your paypal account summary page > 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 or say the word "agent".
OR have you considered contacting Customer Service via Facebook or Twitter?
It's: https://www.facebook.com/PayPalUK and @AskPayPal for Twitter.
Advice is voluntary.
Kudos / Solution appreciated.
