Had a similar issue of multiple charges to my account. I panicked after reading reviews on this site and others about them refusing refunds. Especially since it was the next day.
I was on hold for an extremely long time- over an hour and a half. Within this time I explored disputing the charge with my bank and other options.
Got a hold of a customer rep- explained the situation to her and she got me a refund on all the duplicate orders without issue. Was shocked when the emails came through that they would be processing a full refund. So maybe I just got lucky?