It could mean '(very) well done' ie congratulations or it could be ironical - it serves you right, so it depends on the context.
Tant mieux bien fait (pour toi)
"Very well done, my darling niece. Lots of love."
bien fait means 'well done' or 'serves him/ her right' depending of context.
RSVP is a French term / phrase asking you to respond. You don't need to respond is "French".
The cast of Bien fait - 2002 includes: Mathieu Bisson Nicolas Rigas Agathe Teyssier
tres tres bien monte; well-hung
Tres Bien!
It does me good
bien fait, (ma) fille. "ma" means my.
not very well
Fine and you?
Super! Tres Bien! Excellent! fantastique! merveillieux! superbe!