Amazon India — Product pick-up cancelled after item is being collected

I had ordered Cello Multi Kadai and returned it. I got the message from amazon for pick-up date and i handed it over to the person who came for pick up after confirming it. After sometime the update showed that the pick-up was cancelled. I have been calling the customer service and they say that they cant track the details because of which i havn't got my refund yet. It's been a month now. I contacted the escalation team. They refused to help me. It's a torture to the customer.