Flipkart - Seller intentionally cancelled order after the BBD sales and increased the price

I've ordered a TV(offered price by the seller - **,***.** rupees) on Flipkart during Big Billion day sales on **th of September. The order took * days for packing and finally, there was an update of shipping and promised delivery date was **th September(last day of sale). So, he delayed the order by *-* days on **th September and mentioned the same will be delivered. But, on October *nd he cancelled the order without proper reason and intimation to me. Intentionally he delayed the order by * days, so that the sale is completed, then he cancelled the order.

I contacted Flipkart customer executives multiple times and no one provided the proper resolution. Each customer executive told different reasons that the seller has cancelled the order. Few of them were,
*. Sales state misroute(Instead of going to exact location he went to some wrong address).
*. He called you on delivery, but you did not respond and the seller cancelled the order. (Honestly I haven't got any calls on primary and alternate numbers. Can check the call records as well)
*. *** TV were present and you were the ***th customer. So, he doesn't have the stock and he cancelled it.(How the shipping was updated if he does not have the stock?)
*. The product was damaged during the shipment, that is why he had to cancel the order.

These are the few reasons they were telling and asking me to place a new order for the new price(which is **,***.** rupees). For the seller mistake, Flipkart CE and Grievance team(Sajid/ Sajith) did not help me to solve the issue. Instead of negotiating with the seller, Flipkart is trying to negotiate with me.