Customers Compensation Center C.C.C. Letter with Fake Cashier Check Tappan, New York

I received in the mail after receiving several phone calls claiming that I had won a lottery drawing.  I research the company and I found out that this is a scam sending at random to people a fake check and letter claiming you have won a lottery drawing from certain company you may have purchased from (K-mart, Sears, Wal-Mart, etc.).  I called the number on the letter got a man with a foreign accent requesting the claim number and that I deposit the check ($3,500) in my bank which is to pay for the tax on the winning of $50,500.00 and not to tell no one or give out the claim number and after depositing the check is to call back for further instructions.  So, I thought and decided to look up the company and found several complaints about this.  I scanned the check with the letter. From scanning the check into my computer there was imprinted word ("VOID") you cannot see this on the original copy, but you can see it from the scanned copy (see attached).    Therefore, I want to share this information.   I never entered a drawing or give out my info.  Now I wondering how these people get my information which is to be secure with companies that you purchased from.