Mere bhai,
Who told you to purchase on premium/own money.
You go by the book, go book your vehicle and wait in line get your car. You pay the premium price for premium (early) delivery.
Showrooms keep their stock they book cars for them selfes, because they have to full fill the xyz number of cars quota allotted to them every month.
Later sell on higher prices when theirs is hi demand., showroom owners are investors they do it to create demand, they do it to earn money.
And thoose same dealers sell them under price when demand is slow.
No where here indus motors, Honda atlas or paksuzuki sells under or over price and money doesn't goes to any car manufacturer.
It's all demand and supply, it maybe artificial but that's how it works.
Another example il give you.
I booked a WagonR from Suzuki in July 2018. 1 August the price was changed. My dealer made a commitment that if I pay by 31st July price change wont affect me.
My cars invoice is made on new price but their is a offical discount for rs.30,000 which is mentioned on the invoice.