Flipkart — Not delivering the product keep asking to cancel order from our end

Advertised as Big Sale. We did purchase a mobile from flipkart. They promised to deliver the product withing 3 days. We ordered on 27th July 2021 & it was promised to be delivered on 30th of July. Now its been 4th Aug 2021, still they aren't delivering the product, but keep reciting same versions of asking us to cancel the order and make new order as there is some problem in delivery from logistics and that they promise to make delivery upon new order. What kind of fun this Flipkart is making??