Byju's — Scammed us into buying the trial and refusing to take it back

My father bought the byju's premium kit for my brother in March.
The sales person somehow convinced him to buy the kit for a 15 days trial. The amount to be paid was 88k, which the sales person assured would be returned in full after the trial if my brother doesn't find the kit to be useful.
The lockdown started after 4-5 days. My brother dropped two mails to byju's stating that he doesn't want to continue with the membership. He was told that he can keep using the kit as it was not possible to return it in the lockdown and the return process can be resumed after the lifting of the lockdown. But he didn't use it.
This happened before the completion of the trial period.
After a few days, when my brother again talked to byju's, they told that the trial period is over and the kit cannot be returned.
My father tried to talked to them so many times but they are not ready to listen.
My father is a small town man and bought the kit considering byju's fame.
This is fraud!
Look into the problem or we'll have to take legal action against you.