Byju's — Unnecessary calls from byju's

I left using byju's application film 2018 after my 10th class but still I am getting calls from byju's I am fed up of saying "please don't call me" to the person who is calling me but it have no use every month I receive calls from byju's, I did mail, I did complain over there official website, I try to find delete account option in application don't have delete account option in there i am wondering way this app not have delete account option.

Now i am totally fed up i am urging byju's PLEASE DONT CALL ME AGAIN .