ACS ACLS, Account Creditation Legal Services Harassing phone calls and threats of legal action New York, New York

I received several calls from a person claiming to be from a Legal Department for a company called ACLS on March 9th, 2011. The person, named Amen Watson/Wilson (he told me two different names at two different times) stated that my name and social were involved in a lawsuit for a non-payment cash advance loan with a company titled Advance Cash America. This Mr. Watson/Wilson told me that I had received a cash loan from this company that he represented in the amount of $500US and that due to late fees and other fines, I owed $1200US. If I were to accept the settlement his company was offering, I would only have to pay the $500US, but I would have to fill out some paperwork that he sent in an email. He specified that I could only use a Debit, Credit card, or Pre-paid debit card to make the payment. I questioned him for the details for the case and he told me that the transaction took place in June 2010 and that my case file # was LSU210123580. He also stated that if I didn't want to pay this that I would have to go to court in California to fight the lawsuit. I asked for an address and more contact information and he told me the physical address was 101 East Green Street, Ithaca NY, 14850 and his email was faxes.acls@gmail.com. I didn't make any payments or give him my debit card information because I was uncertain if the whole conversation was real. I did some research online to find that there were several listings of this company as a scam.