If it was this Sunday or Monday you tried that key just be advised, those are the days the freaks come out trying last ditch vault but mostly draining keys. Your io is sporadic, so I could understand a pack of three losers using that as ammo.
If it’s any consolation, it doesn’t matter how good or bad you are, these characters will gaslight you all the same.
I thought I screenshotted the harrassment in party from a group of 3 last night. When I left the group they were wasting my time in, they took it to wispers, but put me on ignore so I could not reply. I can’t find that screenshot, but I know it’s just that sun/mon crowd.
I don’t do that invis skip in Gambit, because like you I am an intellectual, but you really do need to grab a stack of 20 invis pots for 20gold for other dungeons. Don’t let those muppets ruin this for you.