Jiomart — Refund took more than 20 days for refund on missing items

I have ordered couple of items in JIO Mart and delivered on 3rd August with couple of missing items, So I waited for refund will take automatically as the delivery person clearly mentioned the list of missing items but the refund didn't initiated. I created many complaints in JIO Mart app and after many complaints still asking me to wait till 20 days for refund which is less than 500.

Order id:[protected]A