CHECK FRAUD

I NEED SOME HELP WITH A COMPANY CALLED SIRREA INVESTMENT GROUP; SWEEPSTAKES PROMOTIONS & LOTTERIES

THEY SAID I WON MONEY BY SENDING ME A CASHIER CHECK FOR 2,865.71 AND I CASH CHECK IN 4/17/06 NOW ITS COMING BACK TO MY BANK SAYING I OWE THAT MONEY WHICH I WOULD HAVE NEVER CASHED BECAUSE I`M ON DISABLITY AND CAN`T AFFORD TO PAY IT BACK PLEASE TELL ME WHAT CAN I DO ,,

THEY ALSO SAID I WON 102,016.00 WHEN I SEND THEM THE 2,000 FOR SHIPPING & DELIVERY

WHEN I CALL A NUMBER THEY GAVE ME WHICH I CALL ONLY GOT AND ANSWERING MACHINE

THEN AFTER SO MANY TRIES I SPOKE TO SOMEONE AND THEY TOLD ME WHAT TO DO AND HOW MUCH TIME I HAD SO I DID SO IN ORDER TO COLLECT THE $100,000 BUT NEVER COULD GET NO ONE

SO I LEFT THE MONEY IN ACC. USEING IT CAUSE I THOUGHT IT WAS MINE TO COME AND FIND OUT ITS NO GOOD. -1,0916.OO ON ACC. WHICH I CANNOT PAY DUE TO 1 CHECK FROM S.S. DISABLITY