What is the ruling on one who went to a Raqi (exorcist) who uses hypnotism and the Qur’an, and informed him of matters which he believed, and then he repented, but he still believes what the Raqi said?

If the mentioned hypnotism is a form of divination and the use of jinn, then the questioner has done well by repenting from it. Believing what he says varies depending on the motive for believing and the type of information. So, believing him because he knows the unseen is not the same as believing him because the jinn informed him, and news of the past and present differs from news of the future.