Do you have any idea of when this may have occured?
And do you have names of anyone that may have been present alongisde you while crashed you. If you do, then it would be good if you can ask them to upload a replay to a website and give them credit for doing that.
Unfortunately as bowey said, we cannot do anything with this report as long as we recieve some evidence showing us that he crashed you. The reason we need a replay is so we can see if it actually occured and to see if he made any other rule breaks and how fast he crashed into you and why it occured. I look at the pedals being used, the text used and the indicators within the dashboard as well to help me understand the nature of the crash/drift/whatever. So it would be very helpful if you find someone with a replay to proove this to us.
Till then nothing can be done with this report.