Amazon India — I am complaining about a mobile phone

I ordered an Samsung Galaxy M31 on 29 September and get delivered on 30 September When I get it I opened it in the front of the delivery boy and we both saw the product it was Samsung Power bank then I said to the delivery boy take this product back then he said I can't take the product back because it's opened and he said contact customer service and then I contacted them and they said it will take 3-5 days to get resolved and when I opened my email I saw that there's written account blocked when I am trying to open amazon it's not opening then I contacted them from my registered mobile number then they said we can't help you in this matter.Some were saying that you will get an email but I didn't get any email and today I complained then they said me we can't give you any refund because you had broked our policy when I contacted them they were saying it's just of becuase previous order but that mobile was my first order please help in get my refund back I am very disappointed with Amazon.
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