PayPal Has No Undo Button and It Cost Me $687.75

AAAAAARRRGGHHH!!!!!! A customer just cancelled one of the recurring events they were running and picked the wrong date - last week instead of next week. So instead of refunding the two tickets that were sold for the show, they refunded $687.75 worth of tickets for the previous show. Now, this is a comic who runs a small business so I've decided to eat this cost but I really didn't need to. Let me…