OneAssist Consumer Solutions — Cancellation of OneAssist plan and refund

One assist solutions has charged INR 1399 on my card without my consent.I came to know about that on 29 September that when the money was deducted and they have renewed the service on 10 September even without informing me.They do not have the right to reduce even a single penny from a customers account without their consent.This is not the right protocol and should have that much of decency to inform the customer by either calling or sending a text message for asking about whether the customer would like to continue for the next year with the company or not. Simply using the card without informing them prior is an offense.
After contacting them for cancelling the service they have somehow only credited an amount of INR 400 that to as a discount.
I want to cancel the one assist programme right now and demand an immediate refund of the remaining amount.
My one assist relationship no. is 8233583