my game kept on syncing after i waited 2 houus it had deleted everything i have

my game was syncing everytime i put the disc in and it was talking me every time 2+ hours to start the and now after 2 hours of waiting to play the game it was deleted i dont know why can anyone help me how to get everything back because i lost 250 cars and this cost me a lot of money and hard work and my level was around 250