I recently hired a long term member on my forum as head of our content team and two days later he resigned stating he had been offered a staff position at another site, so i removed his powers. The next day he pm'd me asking if he could have his job back because he preffered our site because it is on XenForo. I rightfully refused to make him staff again because of his dis-loyalty and for the fact he had resigned as staff but had changed his mind. I then received a pm from him today stating he was sorry and he linked me to a thread on xenforo.com where my site was veiwed upon as a spammers site because he had changed xenforo's wiki page to link to my forum, i asked him why he did that and he just replied "for the lulz" so ive banned him and his ip but what can i do now? he seems the type who is determined and wont give up easily. Thanks.