It's not a "random" number if they know your address as well as your cell phone number. At some point, you signed up for SOMETHING with your cell phone, or gave someone your cell phone number when you signed up on your computer, and that something sold your information to a list service. That list service then sold your information (along with thousands of other peoples' information) to marketing companies. Some of them are legit. Some are scams.
If you've ever used a game app on facebook, and if your phone number is linked to Messenger, then that is one way your information gets out.
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