Flipkart — Delay of delivery of phone by 3 days

Website: www.flipkart.com

I have kept the order on 13th of this month and the delivery date given was 15th Aug.

And at the day of delivery that is 15th Aug the delivery agent calls at nearly 10:30am and enquire about the address for the delivery.

And till evening 07:00pm there is no update on the Flipkart app regarding the delivery.

We called Flipkart Customer Care 3 times.
First time they told that the phone would be delivered by 11pm. (At 02:00 pm)

Second time they told that due to 15th Aug the delivery is slow and they would try to deliver the phone by 11pm. (At 06:00 pm)

Then when the Flipkart app was checked for any update, it showed that the delivery date has been changed from 15th to 18th Aug.

Third time they told that there is problem from courier side for delivery. They would try to deliver the phone in 24 hours.

And now they are telling that pincode mismatch has occured so either wait till 18th Aug or Cancel the order. (****lines by the Flipkart Customer Care)

Why is this all happening?
If you are not able to deliver it then why are you showing the wrong delivery date?
If it's problem from courier side then why did they enquire about the address for the delivery this morning?
Is this customer care take by Flipkart?

Is this value given by Flipkart to their regular Customers?

Then shifting from Flipkart to Amazon is better atleast it won't make false delivery dates?

At a normal day delayed delivery is acceptable but this the case i[censored]rgency?

If we needed it by 18th then why should we keep the order for 15th.

Is this Express Delivery given by Flipkart?

IT IS A CASE OF "FAKE EXPRESS DELIVERY" BY "FLIPKART" BY EXTENDING "2 DAY DELIVERY" TO "5 DAYS DELIVERY"

Please help regarding this.