@فادى-عمرو.
Oh, that's a long time ago already. Might have either been missed or you didn't send it using the proper method. This is the method you should be using for reporting a cheater:
Go to https://support.onlinesoccermanager.com/hc/en-us and click on 'submit a request'
Select 'OSM' from the dropdown menu to fill in the contact form.
for the question 'Please select an issue that you are having' you should choose 'Report inappropriate behaviour
Give as much details about why you suspect someone of cheating and add proof.
If you selected 'report a player for an offensive name, tag or description' from that first dropdown menu, then you will get an automated reply back that sends you back to the OSM support.
Since that league has already ended, there is nothing to be done about it now, so I will close your topic.