What should you do when someone teaches false Dharma?

I was part of a religious group that claimed to be everything that the Buddha teaches. But, when you listen to their teachings, you can tell discrepancies between their teachings and Buddhist teachings. I just saw many people being misguided, but I do not know what to do. (Just to clarify, the religious group I'm referring to is neither Mahayana nor Theravada. But, the question can be generalized further if necessary.) On one end, I do not wish to create any conflict among anyone. On the other end, I feel sad that many people are misguided into the teaching. So, the question is: What should I do? Any answers based on experience would be AWESOME, and experience + Scripture references (said by famous teachers or based on Pali Canon) would be an Awesome+++infinity. :) Once again, I hope to find a method that does not create animosity. Thanks Buddhist Community! Praises to the Dharma. ******As for an explanation on how this question is different from the forum titled "How to address wrong view", it's pretty much the same, except this is more scenario-based. I just wanted a different perspective/insight to this specific scenario. My ultimate goal is to avoid conflict!!!