As the cardholder, you have no idea who actually charged something.

If you went there, gave them the card and they said they would charge 5€ but ended up charging 50€ - then the card holder have been frauded and can report the deception done by the merchant to get the money.
Here, ffay005 and others have done nothing, and Aktia has let through a fraudulent activity to their account.

Again, I am not in the know of anything here but with my logic, if the police asks "who did something wrong to you" the only truthful answer can be Aktia. Someone else has probably frauded Visa or Aktia but for me to report that would be heresay.