Flipkart - package not shipped even after promote date is over

Order Placed: Your order for Mi A* (Black, ** GB) with order ID OD****************** .I placed this order on *th december and I paid through credit card.Order is of a phone named Mi A*. Flipkart messaged me that within ** december it will be delivered.I complaint on ** december morning as the product was not shipped. They told me that within ** december ** pm it will be resolved.But it was not resolved and they again give me a time frame that within **th december * pm issue will be resolved.But there was no resolve.So I called them and now again they give me time frame of ** december *pm.I already paid for the order and they are not resolving this issue and giving me time frame one after another. This harassment that causing me Flipkart,I want to raise a complain about that.