How to prevent H2N2 or hantu

When some of my students were disturbed or 'rasuk' by H2N2 or hantu a few months ago, there were many advices given by ustaz. The best way is by reciting 'ayat Kursi". Some of the ustaz advised us to recite 'ayat kursi' ayat amanarrasul".One ustaz suggested that we read "ayat Bismillah enam".Then the other ustaz told us to read 'ayat Kursi" and repeat the last ayat of the 'ayat Kursi" 70 times so that the hantu will go away or it will burn down. Whatever the way they suggested I think we have to be strong and seek the help from Allah because Allah is the Almighty.