Just had this happen to me as well. Attempt to enter Gambit, get sent to Titan in a "complete" match, leave, get a "you left an incomplete match" error, banned after this happened 4 times today. Honestly not sure what can be done about it since we generally just get radio silence from Bungie. On another note, it did seem like the others in that room were bots from their movements, so I wonder if that was some sort of GM jail. Not sure why I'd be sent there, but it really seems like one.