Allen career institute kota Rajasthan - Not providing classes in the medium advertised after receiving full payment of fee

I registered my son for the online crash course for JEE **** on *th of June ****. The medium of classes were advertised as English. I paid the full fees for the course on * th of june ****. It was mentioned in the fee receipt also that the medium of classes will be English. Next day, when the classes were uploaded, the teachers were explaining everything in Hindi, which my son could not understand. We are from Kerala. From * th onwards I contacted the Allen institute Kota over phone and e mail regarding this issue. Initially they promised that they will upload English medium videos within **hours. When they didn't do that, I repeatwdly called and mailed them reminding about this issue. Finally after * days they said that they don't have English medium classes. So I asked them to refund the advance fees paid me. Om * th when I contacted the institute they agreed to refund. As there was no response till ** th, I contacted them again then they are saying its mentioned that the fee is not refundable, so they cannot do that. My don could attend even one class because the classes are in a language that he cannot follow and they are not refunding the fees .I have recorded the calls made with the executives of the Allen career institute, and have the e mailssent to them by me regarding this issue . In the fee receipt they have clearly given the medium as English.
I want full refund of the fees