Saving game reset

I've played career mode for hours each day for a week. No when I tried to open my saved files it had reset 4 days. 4 days of playing just disappeared. I HAVE NOT SAVED CHECKPOINT SAVES AND REGULARLY SAVED MANUALLY. I have played and turned off the game every day, why reset 4 days? This Is not acceptable. This game is broken and I want a refund or my career mode saves back.