Does anyone know about logic security group?

i received a letter from this company saying that I won $250,000 from the de-lotto switzerland sweepstakes, out of a total prize money of $9 million, and that I was one of 36 winners 2nd-catergory winners that had been drawn from a random computer ballot system drawn from over 100,000 names. The letter was attached with a check of $4,989 dollars for government taxes, but i am required to pay $2,987 to a tax agent directly via Western Union. After this, i am to be given $245,011 as winnings via FedEx. I nearly believed this, because i was traveling in England (Jan. 2010), and while inside Heathrow Airport, i entered a sweepstakes but i am not entirely sure if this is the same one. I called the number in the letter, and i was told by a man to deposit the check and wait until it is cleared, then call him back and to find out where to deposit the taxes. He verified my name, address, etc. but i didn't give any other info. I saw that there are many reports of scams by this company, so i believe that this is a fake, but are there any comments for this