Can EF Education call the police for frequent telephone harassment?

Of course, you can call the police, but this kind of policeman probably won't care, otherwise the telephone advertisement will be gone long ago, and he won't call you after teaching you a way. When he called you, someone must have sold him your information. You can tell him, for example, I am a student of EF and I am studying now, so he won't call you next time, or you can say that you are a student of other English training. Or you can say that I don't need to go abroad to learn English now. In a word, I won't call you until I get some benefits. Simple refusal is not very responsible.