If you're up for it . . . then use the strategy Black Sheep suggested . . . the truth is they will probably label you a waste of time fairly quickly and leave you alone. If they feel there's still a chance for you . . . you will continue to get contacted (they 'count' this time spent which is quite important to them) . . . maybe even for months to come.
If you want a clean break . . . you need to stand your ground against their indoctrination process.
Keep us posted whatever you do . . . we are interested.