It's dealing with phone sex charges,  can anyone help me

My son who's a US Marine got a call from this number stating they were the FBI and that my son had stolen a friends credit card and made $800 worth of phone sex calls and they wanted his bank account number or they were going to press charges.  My son hung up on the jerks and went to his CO who told him it was a scam, but to change his account just in case.  
Just another example of the low lifes we have in todays world that couldn't make an honest living.  Scum of the earth

Please someone have some sort of info please

Closed my bank account and called the police was told it sounds like a scam

We have been harrassed by this number as well.  What should we do

i  have a client who is getting harassing phone calls from this number. they are threatening prosecution. they told my client they were a prosecutor's office.  who is this?

another call today this time he spoke to my boss and played recordings of some sort I got on the phone and told him I was going to report him to the attorney general. he told me he'd give me 5 minutes then he'd send the police and then he hung up. that was a half hour ago. he told my boss that i was involved vin credit card fraud etc.

I got a call at work from avi saying I was involved in credit and checking account fraud. He said that it did not regard a past due debt but fraud only and he was going to hold off calling the authorities if I called and talked to him about it. said he had recordings and evidence against me. bottom line this guy is trying to get me to pay cc debt for phone sex charges. I m tired of these collection people threatening possible arrest for stuff that is not true.

pls help me on what's going on!

they said he's with a platinum company about fraud.