I know I'm not getting a refund for the hole amount so I asked for a refund for 100. Quite reasonable. I know I'm not going to get it and PayPal have answered:
"Thank you for contacting PayPal regarding the refund you would like to receive. I am very pleased to take this opportunity to assist you today.
I have reviewed your account and I can see that the payment has been completed on October 17th, 2011.
I understand that the conference was not what you expected. However, we are unable to open a dispute in the time frame of 45 days has been passed.
I encourage you to contact the merchant or a Consumer Agency in your country to help you in resolving the issue."
And I do not imagine I'll get a reply from firstname.lastname@example.org
If I get a reply I don't think it's going to be for a 100 refund.