Someone charged $600 worth of online sports gambling to my check card once. It could have been $1200, but the second bet didn't clear, since I was dirt poor at the time
I went to my bank, and filed a fraud report, which I was told would take 2 weeks to process. A big bummer since I had bills to pay!
Luckily I emailed the online gambling site management, and they were very helpful. That was actually a big surprise. They refunded my money, no questions asked, within a day.
Card was, of course, cancelled for a different one.
I went to my bank to cancel the fraud report, after I received my money from the vendor. I even asked, "are you SURE this will be cancelled?" - reply "yes, absolutely." But the bank still put $600 into my account 2 weeks later. It was actually a bigger ordeal to have that now-unnecessary $600 removed from my bank account than to receive credit from the vendor. Hm.
Banks, bleh.