Melly, farming is not an offence and not against the ToU, so he cannot be silenced for that. If he bypasses though, you can screenshot it and send the pic to the mods on pal.
I checked his profile, his stats are low, so why do you have to worry? Just farm the shit out of him. People like him who say they are gonna get an army to farm your ass are usually lying hobos who need girlfriends.
I've already gave that guy a couple of knocks and a warning. If he harasses you again, let me know