Someone hitting their wife black and blue is not acceptable [period]. Unfortunately, it may happen again. Please try to protect yourself from any kind of physical or mental violence at all cost.
Ideally get a medical done from a doctor immediately and get it documented with the stamp and sign of the hospital. Keep all documents, conversations and phone call recording safe.
Move out as soon as possible. Don’t fall in the trap of it is a one time thing – aage se nahi hoga. All discussions can very well be done once your safety is guaranteed.
Inform both sides, then take it from there.