witchcraft do exist. however, we muslims must believe firmly that no one can benefit or harm you except if Allah wills it. everything that befalls us from humans & other creatures is only secondary & is achieved only through the power derived from Allah. so, the best remedy & cure is to continuosly seek protection & refuge in Allah. satan & all his tricks & weapons could be defeated & rendered utterly ineffective if Allah wills.

best protection & immunity for us muslims is by reading Qur'an, frequent dhikr & dua'as. Al-Fatihah & Ayat Al-Kursi is one of the best.

additional please?