Amazon India — refund of vivo s1

I had ordered a Vivos1 phone worth 14000 on 5th December. But I cancelled the order due to some reason. I was assured that my refund would be completed within 5-6 business days. today it's 23rd December and I haven't received my refund yet. I've called them, chatted with them yet they are irresponsible. They told me that they've already initiated the amount but its not reflected in my account. I even went to my SBI branch and asked them but they said that there has been no such transaction. Now when I called amazon customer service they sent me a pdf to charge a dispute form.
I request you to look into this matter and I would be grateful if you could solve this for me. I've mentioned the necessary details below:
Date of incident: 6th December 2019
refund reference: 127252