Amazon India — Refund not received for 1 and half month now

Address:	Bangalore, Karnataka, 560077
Website:	Amazon.in

I had bought a phone (Xiaomi redmi note 3) from amazon on may 4th and it was defective, the replacement did not arrive me on time and the refund was initiated on 16th may 2016 and due to address change it was re-issued on 21st may 2016 and till today i. E 30th june 2016 i have received no information about the cheque or money. The customer care executives keep apologizing as they have no idea where my cheque is. My bank details are updated on the amazon site and i swiped my card on cod for this transaction. I am unable to explain the possible reason for such a delay. Even a legal notice has not helped me.