Does treatment from Muslim Jinn doctors invalidate the fast of a man who seeks their help?

First: It is not permissible to seek the help of jinn for treatment or anything else, nor is it permissible to go to someone who claims to do so, because it provides a means for their worship and for believing them. Sheikh Ibn Baz said: "It is not befitting for a sick person to use jinn in treatment, nor to ask them; rather, he should consult known doctors." Sheikh Al-Fawzan emphasized the impermissibility of seeking their help, whether they are Muslim or non-Muslim, thereby closing this door entirely. Seeking help from the unseen is not permissible.

Second: The fast is valid and is not invalidated by this, even if the reward for fasting decreases or may vanish due to committing sins.