Amazon India — Amazon is not giving my money back

I have purchased Ac 1 Ton portable Loyed got delivery on 14th May 2020 " AmazonTracking ID:[protected]", the AC was not cooling so i decided to return, i called amazon to collet the AC but they said no courier service to pick up and they asked me to send by my own and charges of courier will be refundable too. i did courier the AC back on 15 may 2020, which has been delivered on the same day as it was local dealer. I called amazon customer care to refund my amount they started asking for courier slip which i sent through email, again i called they asking for POD. i called Trackon courier to provide POD they have sent me receiving of consignment which i emailed to amazon. again when i did not receive refund i called amazon, this time they said refund can not be given as i have not sent POD. I ask them to call seller to verify the receiving and also they can clear the things by calling trackon courier services and i have already provided receiving to amazon, they replied they will not call anyone its my job to provide POD or forget about refund. Amazon is not willing to give refund even after i returned the AC and is being received by the seller, it was my hard earn money and i feel cheated by amazon . i called trackon to provide POD they said they have already provided sellers receiving to me with sellers stamp and sign and is a proof of delivery, its almost 45 days of mental harassment to me by amazon but they are not giving my money back, i need urgent refund of Rs 26500 + Rs 1000 courier charges.