CASH NET MARKETING Cash Net telling me I'm being sued for fraud not paying my load Internet

8/4/10 I was contacted by a Robin Wilson (he was Indian or Pakistan do you really think this is his name) he told me that I was in trouble that I owed Cash net marketing money and that I bounced a check to them and was being investigated for Check Fraud, Fed Bank Reg Fraud and something else.  I could hardly understand him.

The scary part is he new the last 4 digits of my social security number, my home address and cell phone number.  I'm worried about my bank account.  He threatened that I would lose my job and not be able to get another, told me to get a lawyer.

I don't have a loan with cash net marketing.  He told me this happened in Feb and I said if this happened in Feb why are you calling me in Aug.  I told him I couldn't understand him and give me someone who speaks better english.  He just ignored me and kept threatening me that I was going to jail etc.  At first he scared the daylights out of me because I have used a payday loan but not from them and mine are paid in full.

I'm just scared that they have my entire social security # and bank account.  Not sure what to do.