Where a ma'aseh (action) is done: There is an issur D'orysa (Shach Y.D. 179 :1 )
Where no Ma'aseh is done & witch is a Goy ,( just asking for advice) :
1) Trumas Hadeshen : (2:96) For a sick person even if not Choleh Mesukan , it is permitted.
2) Teshuvas Maharshal : (3) Only for a Chole Mesukan is it permitted.
3) Zohar: Even for a Chole Mesukan it is not permitted. (Kishuf = Avoda Zarah)
According to the Zohar going to a fake Kabbalist (might be practicing kishuf) is
a Safek Issur D'orysa of Avoda Zarah (Yehoreg V'al Ya'avor)