ACS American Credit Service DO NOT LISTEN TO THIS COMPANY--RIPOFF New York, Seattle, New York

I received a call today at work from a "federal law investigator" stating I had a lawsuit filed against me. The call was from a middle east guy that was hard to understand and he asked if I had ever been arrested. He then starts to tell me that I owe $300.00 to a company that he could not give me the name of (imagine that!). He wanted me to send the money immediately and if I did I would only have to pay $210.00. He then asked for my bank information and wanted me to fax a letter stating that I would pay it along with the debit card number.
I really got suspicious when he couldn't tell me what company he was representing and if I paid I could then get the information. Sorry but I wasn't born yesterday!
I work for the Federal Government and this concerns me because if they call and make threats like this I could potentially get in trouble. They called in January except it was "Upfront Cash" and I owed them $1100.00 and of course I needed to pay that immediately or I would be taken to court in "my county in Ohio". I turned the first call into the Attorney General's office and the investigative unit from work sent them email stating to never call again or they would be investigated by the Federal Government or F.B.I.
Everyone in the background was also foreign and I could hear them yelling at people and threatning them. How do we get this to stop?? They have even called my supervisor and I have no clue how they got her number (this happened both times). By the way the phone numbers were the same ones from January and they are from Washington state, 206 area code.

Please don't fall for this!