Is it permissible to deal with a person who claims to know the unseen and what is beneath the earth, and whether a person is envious, bewitched, or righteous, without using apparent means or ruqyah as prescribed by Islamic law, and is it permissible to believe him?

It is not permissible to deal with someone who claims knowledge of unseen matters, because he is either a soothsayer or deals with jinn. The Prophet (peace and blessings be upon him) warned that whoever goes to a soothsayer or diviner and believes him, his prayers will not be accepted for forty days, or he has disbelieved in what was revealed to Muhammad. And whoever fears envy or the evil eye should perform ruqyah according to the Shariah.