I don't want my roommate to connect to my isp because he downloads things illegally and my isp(Comcast) contacted me . So I changed my WiFi password, so he wouldn't have it anymore. Long story short he went out and bought a WiFi and modem but I believe is still using my isp(Comcast). how can I banned him forever using my isp service ,since he found a work around. Can't asked him to leave he is a family friend and plus we have a rental agreement for six months ugh.