It is Haram (prohibited)
to go to charlatans for treatment. The ways of treatment you mentioned are charlatanic and superstitious. Their only aim is to unjustly seize people's money. You did well by disapproving of those who wanted to treat your father through charlatanry, and you fulfilled your duty of guiding and advising them. There are several authentic Hadiths from the Prophet (peace be upon him) (Part No. 1; Page No. 644) forbidding resorting to, consulting, and believing charlatans.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.