Amazon India — Sell product more than MRP

I have ordered Eureka Forbes vaccum cleaner but they provide the used product and charge more amount than MRP. The product price mentioned on product is Rs15290 but they charged Rs 15400. I tried to return the product but every time they just approved the return but no one come to pick-up the product. On 26th September 2021 the product was delivered from that day i called the customer care service they told refund will come in 3-5 days.Still i am not getting any reponse. They just mentally harassed me and my family.