Flipkart — Items not delivered also not able to cancel the order

I have ordered washing machine wide order id OD[protected] on 19 mar 2023, with exchange offer, as per Flipkart time line Ordered items will be delivered on 20 mat 2023, delivery person reached and evaluate old item and informed old washing machine exchange was rejected without any valid reason immediately I have contacted customer care they are also not responding properly, I can't cancel the order I asked customer service assistance for cancellation but they diverted me to call the delivery agency but delivery agency not picking the phone now even after 5 days I haven't not received any information/material regarding this. I request your good self kindly sort out the problem and resolve the issue as early as possible