https://www.bungie.net/en/Help/Troubleshoot?oid=13967 Report them with the contact form at the bottom of the link above. You have screenshot proof. They actually will get a restriction or ban believe it or not. Bungie has been pretty on the ball on that stuff lately. One of my clanmates got a 2 week restriction on crucible and IB with just one report because he was frequently disconnecting due to a poor internet night. Another of our members got the same deal for being with him each time even though he wasn't disconnecting. They aren't messing round anymore I guess and actually handing out the banhammer.