Following and threaten

I don't know where to start... a stupid player has tollen me he know how I am, he asked about stuff and im sur he investigated about me.
I don't know if I should laught or cry, he is threatening me don't to attack his zones.
How can I report this? in game there is no option for that.
Greetins

Hello,

Thank you for reporting this. If you think better for you to warn us about this, it seems you feel threaten about this player.
So please share us his username as reply or by private message to me.

We will take care of this then.

Looking forward,