TEFL Heaven are not a scam. They are very professional and have sent thousands of people to learn their TEFL training and then to teach abroad. I'm replying to this because I am one of their Alumni. I went to South East Asia through TEFL Heaven and do not have a bad word to say about them. They require a Skype interview to be sure of your English speaking skills and to get a feel for your desires as to why you want to teach abroad. That is what I was told during mine anyway, it also makes it more personal, you get to see who you are dealing with and that gave me a real piece of mind.