Icici Direct — Iam charged rs 826 for a demat account without any transaction

In 2021, I opened a icici account stating it was free demat account . I knew nothing about stock market and wanted to check it out . I have not made a single transaction with this demat account till date. Now my account is in dormant state . They are forcing me to pay this much amount by bombarding emails and calls saying i will be penalized further amount if not paid . I want my ICICI Direct demat account to be closed and Im not willing to pay for a service I haven't made a single use . This is so unjust from ICICI