Second minor credit card fraud in a month...

Last month, someone tried to use our credit card to pay for crunchroll online. Only about $1.50.. Seemed like someone was testing if the card could be used.. So we had to cancel the card and get a new card number. 1 month later, now the same thing happened. Crunchyroll for about $1.50 The things we used the credit card for over the past month were normal.. No clue how the fraudsters got the credit card number this quickly.