I typically use some number I find on the company's website, like: https://www.oracle.com/corporate/contact/ Same for web feedback forms where I don't want follow-up questions, [email protected].

Until your nemesis says “Yeah upgrade my account for all that cool stuff!”

that's when things really start heating up between my nemesis and my other nemesis (and people talk about the equifax leak like it's a bad thing!)

They verify the number in the sign up process.