Amazon.in - Ptoduct picked up but refund not issued

I placed two orders from Amazon on May **, ****, and another on September **, ****; both orders were delivered to me, but the product was incorrect and defective. I initiated a return, and they picked up the order, but no refund was issued. I contacted customer service, but they were extremely rude and did not assist me at all, and I am now left without the product or money. Their support initially promised that I would receive a refund, but after a week, they denied it, and they committed fraud against me twice within the same year. On amazon app it’s showing that they lost the picked up order in transit.