Uco Bank — about not issue my refund from amazon.in

I brought a product from Amazon.in, i return it to them. now I suppose to get refund from Amazon.in amount of 799. i paid them through paytm upi. then they are saying that they have send me refund on same upi and my Paytm had not received my refund yet. Paytm are saying that they had not send refund money. my refencee id[protected] for Paytm upi my bank is not supporting me properly