Flipkart — Grocery not delivered from past 6 days

I have ordered grocery from Flipkart on 3rd of August 23, I was given a delivery slot of 4th August 23. On order tracking page they are daily changing the dates and not delivering it to me. I have already paid the amount in advance and there is no option of cancelling it also. I am calling customer support also from past 4 days, they daily says that I will get the delivery by next day and close the call. They people have no option of taking any complaint also and no option of providing any support. I am very disappointed as they have trapped me into it. Pls help