National Insurance Company — Renewal done wrongly

My Policy No:[protected]. Yesterday 03.09.2021, I renewed the this policy online paying the amount Rs.24719.00 through SBI bank, Anna Nagar, Chennai inadvertently.
Kindly cancel this renewal. My renewal date falls on 06.09.2021.
I wanted to take Senior citizen Mediclaim and wanted to increase the sum assured to Rs:3, 00, 000/- instead of present Rs.2, 00, 000/- policy
Advice me to renew after the cancellation of above policy what is the proceedure ??? I need to pay the difference or full amount after revision ???
V.R.Premchand
[protected]
[protected]@gmail.com
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