Main Menu > Support Desk > Report: Harassment, Bad names, RMT, etc. There will be a GM call button there.

Before you do that though, try logging out/back in (if youre the type of player that doesn't log off and just AFKs). Also try changing classes and changing areas and then trying to start the cutscene again. There may be a ( ! ) on the minimap you might be missing, but hopefully doing one of those things may reset it.