Every therapy that claims a guaranteed success is a scam. I checked out their website, claiming to have all different experts and therapy claims, yet couldn't find a single professional that would give it's face and name to be visible on the website. I would stay away from it. I'd recommend to contact the [Indian Stuttering Association](https://stammer.in/home/) and ask them for trusted therapies and professionals. [They also warn against scam cures.](https://stammer.in/our-approach/)