Well, you didn`t understand how does it works. No offense, you are a foreigner.
They ignore the newbies. They are not there for the money so they do not give a s…t.
If you continue going and they see that you try hard, you improve and you have some talent, one time she is going to correct you something. If you do not correct it right away, she is never going to correct you again. As soon as you add to your dancing her corrections, she is going to continue correcting you. Simple like that.
An this people really know what they are talking about.
To take private classes with them makes sense, but I do not think they are going to do it with a begginer. They are very generous with their knowledge but they do not waste their time neither.
The big deal in BA is to learn with people with decades of experience.
I forgot to mention the practica of Parejita but she said she was just learning.
I do not know if Bravo is still alive, but that guy invented many of the giros we know.