A screenshot of my Android notification centre, showing an unsolicited WhatsApp message from Amazon, advertising their Black Friday deals. I checked and it is very much legitimate.
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[–] 17 points 11 months ago*

In that case it's not WhatsApp itself, it's a business using your phone number to message you.
If you open the chat and click the name on top, there should be a toggle to turn off "Offers and announcements" for that account.
If not (or you don't wanna receive any messages from the sender at all), just block them and make sure to check the "Didn't sign up" box.

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