My experience is exactly what several others have just reported today or yesterday.
Guy with middle eastern accent calls, says I defaulted on a payday loan. collection agency ACS for "Cash Advance USA." Since I have no loan with this company, but have had loans with some legitimate company that are not in default, I asked him to say what date the deposit was supposedly made, and from what company name. He said they represent 17 (or 57 or 250, don't remember actual number, but large number of companies or names they do business under) and couldn't give me a date or company name. Almost impossible to understand accent. Transferrd to 2 other people, just as unintelligible. When I asked for US phone number, they hung up.
Since I have indeed provided sensitive personal information to similar sites in the process of investigating possible payday loan sources (worrying about info theft but not being in a position to do anything about it since I needed the service), I believe these scammers get most of their information directly by putting up dummy sites that mimic those of real companies.
I wouldn't worry about it so much if it weren't for the message your complainant "kamico" just posted--that his sister had received a call. I have given some of these sites names of family members or employer contacts with phone numbers, after receiving assurance that no one would be contacted if the loan is repaid. This is terrifying to think that these scammers could have got ahold of these and might call my people.
What is truly appalling is that when I went to your site, I saw that this exact operation has been going on as long as since 2009--not even changing their name! Where are the prosecutors in this country??? (If would answer my question, "but these crooks aren't in this country," except that several posters here reported various local phone numbers they reached them on. In my case, the number left in my phone was just a bunch of zeros.