Byju's — fraudulently sold the product

I, sakina khety, the student from father angel highschool, virar east, standard 8th want to lodge my complaint as under:
That, some byjus examination was taken up in my school and according to my school performance and/or as per the policy of the company, one sales person of byjus named bipin nair (Contact no.[protected]) visited my home and explained us regarding byjus learning app. And he gave us a time period of 15 days in which we can use the product and decide if we are interested in the said product or not. My father is a disabled man. He took all the doc from my father stating that he wants it for record. Innocently, my father provided him with all the doc. My parents agreed to his request. Within 7 days, when we tried calling him back, he deliberately did not receive our call. I can produce the call log whenever required b you. Hence, the teacher who assisted him named neha trivedi, she was informed by us repeatedly that we are not interested in the byjus app, so they can take tab back. She showed a casual approach and kept on delaying the matter, meanwhile, we also tried to called said bipin nair, he received the call and he was informed that we are not interested in byjus
After a month, to the shock and surprise to my father, an emi of rs.4784/- was deducted from the bank of my father towards the emi of the lenovotab4.
Thereafter, the bajaj finance people started harassing my father for further payment and till date they are harassing.
Several calls were made to the byjus for cancellation, however, we did not receive any concrete response from there.