Amazon India — did not get refund from 1month still waiting

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I had ordered optimum nutritions protein and had paid money 5999/- via upi. I had requested return and return has been done on 2 feb but from 2 feb i did not get my refund and i have called customer care many time and every time they say it will get refunded in 5 days and its almost 1 month i did not get refund of 5999/-. This was not expected from such big shopping site.