[throwawayffffas]

Hm... They all got the right product the "cheapest result". You didn't specify the cheapest laptop.

Arguably the ones that got the laptop, assumed you wanted a laptop, and went against your instructions.

[amoshaviv]

I see where you come from, but humans to tend to phrase themselves that way, and intentions are understood, but more importantly, the last step is:

"6. Navigate to the cart page and validate the laptop you chose is in the cart."

So one could argue inferring this is trivial.