ANSWER:

This is not permissible at all! You cannot go to such people at all as they are apostate disbelievers. 

Such people are professional liars and sorcerers and they make millions out of people. Believing them takes a person out of the fold of Islam. Listening to them without believing them makes the prayers of 40 days void.

If person claims that he can know future events (e.g. how many children he will have) by praying to Allah through dream, should we believe him? Or he should be termed as Kafir, so do person believing his claim?