Amazon India — Refund denied after return of the same product that I received

I have ordered fuji flim instax mini camera from amazon on 3rd of oct. Upon ordering the product that I received was of a different colour. I have initiated the return and have asked for refund on the same. The return was picked up on 13th oct. But today its 23rd oct and they have not yet initiated the refund. I have not received the refund for the product and the product is also with them. This is cyber bullying from amazon being such a big brand. Attatched is the product that I have returned as I have received it.