Sad to see ya go. Sucks when a player targets someone enough to make them leave, happens too often in garry's mod. We do have the support channel on discord for faster support, but know its a pain to get proof on-hand. However, if you so choose to stay, you should apply to be Trusted. This will allow you to manage the area around you. Meaning ban players who refuse to follow server rules. It does take extra effort to earn, but its worth having.
So this player in question will be dealt with, will check logs to see how far this really went. Goodluck on your search.