HELP!!! won't upload any activity on single player

Xbox 360 won’t upload any activity on single player. It did when I started. Somehow there was a glitch. I had over one million dollars that night and when I started to play the game the next morning I had over 25million CR and 202 cars how . Somehow all my game stats are gone. Still have online LV35 but no stats. I can get on line and play ???. I had to start all over at the beginning. Still won’t download or upload any activity I do on single player WHY? anything I try to do like storefront my teams garage Or anything I try and do even get my message I have money there to get and it says it’s not able to download it or disabled and contact you here on but where there are no support for Forza Horizion.
Stephen W