Hi Claudia,
Thanks for reaching out to us! I would be happy to help you ?
There is actually a banner on top of the Event Aggregator product page which warns about the Facebook issue, but maybe we should repeat that message somewhere else.
Anyway, we really would like to work with you on this. Would you be interested in a license for the remaining time for one of our other plugins instead of a refund?
If you are more interested in a refund, you can fill out the refund form https://theeventscalendar.com/knowledgebase/refund-policy/.
Please let me know if you have any other questions!
Cheers,
Jeremy