I would think it is obvious what is going on. When you failed to send money they begin harassing, when that fails the threats begin. They rely on those inexperienced and uninformed in regards to magic also being naive and gullible. Do not be an easy target. If you can not resist playing along and have concerns then simply do cleansing, banishing, and protecting magics. We have plenty of such spells in the site spellbook. An even better idea would be to seek advice from those in your coven. I happen to personally know your Priestess and she is quite knowledgeable, skilled and experienced.