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I am sorry to hear about this situation. Yes, there are some steps that can be taken.
1) If it is not too late, one can call card services and explain that the card was used without permission for the 2 POS. Then, it would be at the card services' discretion whether or not to reverse the charges.
2) For the ATM, a demand can be made for the money to be paid back. If the money is not paid back (for the POS or ATM), then your son can (a) file a civil complaint against the individual in court for the money used without permission, and/or, (b) file a criminal complaint as well. That's right - this can be a criminal matter because the individual effectively stole money from your son.
A letter threatening to do this unless they pay back the money may be often enough to have a matter such as this settled without the need of having to go to Court.
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