Let's just call it theft already.
Registration money paid, services not rendered, zero communication/resolution. Your organization has robbed its community and ran for the hills.
("It's Fitlab, not Ragnar" -- great, feel free to clarify and clear your name.)
It's disgusting that you would frame this robbery as a Ragnar-style "challenge we'll overcome as a team." How dare you exploit the spirit of this community as part of your scheme.