Flipkart — Customer harassment for refund

Product can't be picked up. But they are harassing me by giving false promise about refund. My product has not been picked up till date. I have complained many times. But they had promised me about refund within 27th March, 2023. But not received till date. I request them for calling, but just a missed call returns. Sometimes no call received but they have mailed me that they have called but no call received. Im getting harassed. No refund till now.