Invalid pickup

I received a call regarding the pickup on 21 August, and the shoes were actually picked up that same evening. The pickup agent also called me twice that evening before/while collecting the shoes. I have proof that the pickup was completed on 21 August. However, I have still not received my refund. I also contacted Flipkart Customer Care, but they told me that according to their records, the pickup was not completed. This is incorrect, as the shoes were picked up on 21 August itself. I request you to please verify the pickup using the agent’s call details