Amazon India — Indefinite waiting for refund against non-received and cancelled order

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Printfidaa multicolor floral painting printed designer hard back case for sony xperia xz, xperia xz dual f8332 back cover
Sold by: abhyan enterprises
Rs. 249.00
Above product was ordered with prepaid on 1 aug. Delivery date was given as 10 aug. Which was not met and was extended to 20 aug. Which was not met either. The last track date visible was 6 august and remained same till end. After waiting further 3-4 days the order was cancelled.
Amazon said it will refund money when they get back the product (Why?). There is no time limit fixed also. Why am i being harrased for no fault of mine. When i never received the product refund should have been done immediately. I am still waiting. I do not know till how long.