Flipkart — Regarding delayed delivery and extending delivery without notification

I ordered Moto edge 20 Fusion phone on 7-Oct-21 and date of delivery was mentioned as 18-Oct-21, I can see/track my order is reached to nearest hub on 16-oct-21 at 5am and which is only 2-3km from my home.
Today evening (i.e. 18-Oct) when I checked the status I can see my order delivery postponed to 20-oct-21 without even notifying through text/email/mob notification to me. Now it's showing that order will be delivered by 20-Oct.
I can track that my order is at same hub from date 16-Oct.

I'm totally unhappy with Flipkart's service, just because I paid full money for mobile and in-return they aren't providing timely service.
I can see lot of complaints having same issues of late delivery and extending the delivery date without notifying the customers. I believe they are utilizing this money to gain interest in the name of Big Billion days.
By doing so you are loosing genuine customers.

I tried contacting customer support but I understood that all calls automatically set to bot/automated system. They keep telling you will set up a call with customer executive. And for suprise I got a call from them and within 5 seconds call got dropped from their before picking-up. I know for sure they will tell in defense that we called you but call went unanswered. I have screenshot of in how many seconds call got dropped from their side. Also they defense themselves by saying 16th was Dussehra. but what about other two days.
I saw Ekart person delivering goods in my nearby area then what's wrong with my mobile delivery.

I'm totally unsatisfied with Flipakrt's delivery service and I need my order to be received to my address as soon as possible. This is not the first time that they are to late for delivery.
I'm expecting immediate action from Flipkart.