Amazon India — Fraud of adding 5k in their amazon pay

I have ordered a laptop from amazon with order id[protected] and they have to deliver it on 5 oct 2022 but they kept delaying it, when the person came to my doorstep i asked him to let me open the box and check the content and he denied to me and left. After that i had a call with customer care and they said i can check the content in front of the delivery executive. After that i have tried multiple times to call the executive but he kept on either ignoring or disconnecting my call and when i had around 5-10 calls with customer executives they assured me to deliver the product on the same day but the product was not delivered. Because of my unavailability i had a call with customer care on 6th oct and asked them to deliver it on 8th oct in evening and they were ok with it. On 8th i got the delivery message and then i received a message that the product is returned. In the order there was a 5k amazon pay cashback for which they shared the gift code but without me adding that amount in my amazon account the amount was added. Now they are forcing me to use that amount through amazon pay only and because of this now i am unable to buy the same product from other websites or sources and they also did fake commitments of sending me the same laptop without me paying it again and manage the payments themselves. Now i am totally stuck facing lot of financial issues as i needed that laptop for my business use case and this is a complete fraud as i dont have enough money right now in my hand to buy another similar laptop when deals are there. I also feel harrasses because of their again and again fake commitments to me