Booked set of lessons a month in advance. The money were processed and withdrawn from my account without any problems. When time came, they cancelled all lessons several days before they should have started. Turned out, you have to be a teenager to use their service. Well, if TDA ever reads this, could you please give people a favor and fix the web site, so that when somebody books a lesson, check his/her age and don't allow to proceed is they are older than 21. The site currently asks for date of birth anyways. The problem is, if we knew they would have denied us, we would have not spent a month just waiting, but found something else earlier. [Apr 2018 Reply to the owner's post] Appreciate your response. I'm sorry, but when booking online the TDA website asks to enter DATE OF BIRTH, which using basic math gives you the age of a person applying. Unfortunately, you missed the point, you could improve your web site to reject applicants who is older than 18, and do not allow them to pay neither book the sessions. And, why should I contact you if I can just do everything online? I guess it's not a requirement to call the office after the online booking process completed? Read Less