Byju's — Cancellation and Information

I enrolled to the Byju's course because they told me that if you not comfortable with the course, you can cancel within 15 days from enrollment time.
Then, I enrolled into the course I attended the classes one week, I was not comfortable with that content.
I cancelled the course according to company rules.
But, they have not canceled the course yet.
Every day they are calling and asking me full payment, then only Byju's will cancel your order they said.
Every day my CIBIL score is getting down because of Byju's order.
Every day Byju's employees are calling and asking money.
I am facing mental torcher because of Byju's since February of this year.