Fraudulent activity on my credit card

i received a call today about a suspected fraudulent activity on my credit card (HSBC). It turned out to be real. It was in the amount of $320 [which is the limit for this card] and the transaction was made under the name of Vueling Airlines (which i have never heard of but after googling it is a real airline based in Spain). The good thing is that HSBC called to verify and it was declined since it was not me. The only info HSBC had was the merchant name and that it was made over the internet. i use this card for paypal which is the only place where the info is ‘stored’…and the limit i have on this card was low for this particular reason. what concerns me is that what other info could that person have about me and transaction amount is equal to the limit of the cc..also if there are any steps i should take after this…i am going to send am email to that airlines just to inform them about this incident.

i have never had this happen to me before with any of the credit cards i have. anybody been through this?