Hello,
If you have already sent the mail to mobilelegendsgame@moonton.com, plz be patient and wait for 7-14 days since they are more busy right now due to chinese new year too.
if you are no longer able to login to your acc that got hacked, you can create a new ML account or use another account and then submit the Account Hacked form through in-game cs
You can do this step if in more than 2 weeks there has been no response through the email you sent