Flipkart - order cancelled without my consent

I paced an order for lenovo ***e laptop today morning, along with it I selected 'buy back guarantee' by mistake.

for that I sent a message to flipkart stating: "I have placed an order for lenovo ***E, but I didn't want buy back offer. this option was selected by mistake.
I still want that laptop, but I don't want buy back option, can you please help me cancel this?"

In response I got an email stating: "we understand your concern that you want to cancel your 'lenovo core i* *th Gen - (* gb/* tb hdd/dos/* gb graphics) ip ***E laptop' with order id: od******************.
" & my order was cancelled without my consent.

which part of my mail made you 'understand' so??

I made a request to cancel buy back guarantee offer, not the laptop.
I clearly mentioned that I want that laptop, if cancelling buyback guarantee was not possible you were obliged to inform me
first.

I expect them to reverse the cancellation of my order & deliver the product by tomorrow (as promised)