This is not Spectrum, at least Spectrum is telling me it's not (and not even an affiliated party). Like others said it's a lady trying to sell streaming service, and when I told her I'm interested in internet-related promotions, she "looked up" something and then transferred me to her supervisor "Paul Skinner". They both claimed they're located in Texas but that the main board is in Alabama (red flag #1); in addition their department was "Promotions", This Skinner guy offered 60mb/s on top of my current set up for $62.99/month, and they already had my information but he kept insisting he required my email (red flag #2). I ****ed up and gave him my email since majority of the past calls were legitimately from Spectrum, which at that point he told me I'll be receiving an email in forty minutes which then will upgrade my service with current equipment (red flag #3). Immediately hung up, called Spectrum and told them the situation.
Spectrum's assessment is that if it's not an 818 number then treat it with caution, and their current internet packages are 100, 400, then gigabit, no weird 60 something inbetween, even for promotions, ever. Their concern was that the streaming portion sounds legitimate, but everything related to the internet package they advertised was fake, and if you're a Spectrum customer then they won't ask for your email or any other information (they already have it, there's no need for them to ask).
Tl;dr treat all streaming service calls as a fake, block, and report.