Flipkart — Product not delivered need to lodge a complaint

I ordered a mobile on October 8th. Product shud be received by 14th but it was not delivered and changed the date to 16.. again it was not delivered and changed to 18.. again not delivered and changed to 20. One person from escalation team contacted and asked to reorder and cancel the old ones. I cancelled and ordered another. It reached the nearest hub but still not delivering the order. Help me to proceed legally and resolve the issue