Ruling on going to a fortune-teller if one believes he is a scholar

A man was afflicted by a jinn, so his father took him to a fortune-teller, believing, as his parents did, that this was not a fortune-teller but a scholar. Then they took him, and that fortune-teller expelled the jinn, and he was cured.But when he was cured, the son spoke to him and said to him: Do you know the unseen?The fortune-teller said: Yes.
I know the unseen. Then his father took medicines from this fortune-teller and forced the son to take them, so he took them under compulsion. What is the ruling for the patient; does he sin? And what is the ruling for his parents when they forced him, while they believed that this was a scholar and not a fortune-teller?
As for the matter of the parents, since they forced the son to go to this man while they believed he was not a fortune-teller, there is no sin on them. However, the obligatory thing is that once it became clear to them that he was a fortune-teller, it is obligatory for the man and his parents—also—not to return to this fortune-teller, but rather to deny him;Because: (Whoever goes to a fortune-teller and believes in what he says has disbelieved in what was revealed to Muhammad (peace and blessings be upon him)).