Oh, man, THAT SUCKS! I’m sorry to hear that, and I hope you are able to get that money re-credited to your account.
We’ve had it happen, too. I watch our bank accounts online daily, because of that. Once several years ago, I also had someone hack into my Amazon account and try to charge an 800-dollar camera on my debit card that Amazon automatically saves on your account when you make a purchase. Fortunately, the sale was rejected since there wasn’t that much money in the account. Since then I immediately delete my card after every purchase I make on Amazon.