Amazon India — Ordered lava 5g mobile 8999/ received usb cable

I ordered lava blaze 5g(renewed) mobile from amazon on 1st feb .on 6th feb when packet was delivered by deliveryman i looks like small size .i complaint to amazon helpline at time of delivery i hold the delivery man for providing small packet but helpline person assured me of refund and told me to free deliveryman .i have the full conversation recorded as proof. further when i opened the packet it was just tiny usb cable (video proof).now after 12 days amazon is delaying refund date after date on mails if solution dont come early i have to file case againt amazon as i have sufficient proofs