Amazon India — Bought a phone on Amazon under Exchange ,but exchange failed for two consecutive days of my old phone

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Bought a new phone on Amazon under exchange scheme when phone arrives exchange was failed for the two consecutive days of my old phone, , , i called CC and told the whole story for 7-8 times but they dont have any solution for and said everytime we rescheduled your delivery problem will be solved nothing was happend ...still have this issue