Is it permissible to do what was mentioned, namely writing Quranic verses with a specific ink on cloth and the body to “break free from the قرين (qareen),” and what is the ruling of Islamic law on that?

Sorcery is a reality and has an effect. If it is highly probable that a person is bewitched, they should seek treatment through legitimate ruqyah (incantations) that do not contradict the fundamental principles of Islamic law. Ruqyah is performed by an individual reciting upon themselves or by requesting someone known for sound belief and adherence to religious obligations to perform it for them. The method mentioned in the question is not among the legitimate ruqyah methods; rather, it resembles the actions of sorcerers and charlatans, as it asserts knowledge of the unseen and uses specific rituals that have no connection to legitimate ruqyah. It may also be a mixture of truth and falsehood. Therefore, treatment with this method is not permissible. It is advisable not to reject a suitor if he is religious and has good character.