Flipkart — Luminous inverter tubular battery

I ordered a luminous battery in Flipkart and they showed expected delivery date 21oct 2021.I checked till 21oct 2021, no update.Suddenly on 22oct 2021, flipkart showing the product has delivered on 8th Oct 2021.What a joke flipkart is doing? From 22oct I'm trying to solve my problem but I am unable because at each time they give time for 24 to 48 hours.After 24 to 48 hours again same sentence.Many time I called customer care, the customer care not get connected.Many they called me and made me waited for 30 minutes for checking and after that the call disconnected.What a joke flipkart is doing. As days are passing, flipkart is loosing realiance.