1 Timothy 5:20 (ESV) As for those who persist in sin, rebuke them in the presence of all, so that the rest may stand in fear. 21 In the presence of God and of Christ Jesus and of the elect angels I charge you to keep these rules without prejudging, doing nothing from partiality.
The thing that empowers the occult is stealth and cover and secrecy. Give them a scarlet letter. Bust them out publicly and they will at least consider their ways.
Ephesians 5:11 (ESV) Take no part in the unfruitful works of darkness, but instead expose them. 12 For it is shameful even to speak of the things that they do in secret. 13 But when anything is exposed by the light (King Jesus is the Light), it becomes visible, 14 for anything that becomes visible is light (or Christ exposed it). Therefore it says, “Awake, O sleeper, and arise from the dead, and Christ will shine on you.”