Introduction: I have a facility, or I guess more of a room I teach out of. I know it's hard to believe people nowadays, but I have taught around 12 people, some are just not apt to it.
If this is the case, I offer six months worth of refunds. I have had eight people who successfully learn, which I am still a little surprised because it's not easy.
The only thing I tell my clients is that their time with me is for a lesson not a practice. If I feel that they are not practicing at home, I will tell the parent/guardian immediately and reduce the charge so both parties can agree on what it should be.