About 2 years ago I was banned from Forza Horizon for a “modified game save”. At the time, I did not know what it was, after some research I found out that it was modifying the game or something along the lines of that.
I was confused at the time because I was playing perfectly fine and I went to London to see other family members. A week later when I came back, I was banned and I didn’t know what to do.
An altered game save is a very serious violation of the Xbox Live Code of Conduct. You would need to send an email to the developers at forzafb@microsoft.com, and include all gamertags which have ever used your Xbox 360.
Neither bans nor the enforcement of the regulations are discussed on these forums.