Thanks for your reply guys! I'd had a conversation with the store they are saying now the device is activated so cannot help, the store manager keeps saying sorry nothing else.
Main issue is 7 days back when I gone to store to buy a new mobile they didn't even bother me to tell about new iPhone X being launched, so as a consumer I feel cheated / mis-guided.
I'm stuck in this thing

I don't know what should I do, I clearly understand they wanted to clear the iPhone 8 stock thats why didn't told me about the latest device.
Should I go with consumer court complaint? Because I've spent around INR 73000 (1,127.30 USD) and the other iPhone is INR 89000 (1,374.32 USD) not a big difference and even I told store that I'm ready to exchange.
I don't know what should I do!