Byju's — byju's product

We got this product on 20 january 2020, on 5 febuary 2020, we asked our salesman to return this product because we were not able to understand and were facing eyes issue, he said to solve but after few days when no step was taken then, we call him again but he ignore our call. Also he said to provide us with all subject except computer and hindi but only 2 subject we got. Till now there is no action is taken and they are taking money as installment of emi. We also contact but no one is solving our problem.