Disable ability to reset password by being called with an automated message

A month ago, someone managed to hack my comcast email by exploiting a feature that comcast has where it will call you via an automated message and give you a PIN code to reset your email. The automated message was left on my cellphone voicemail, which the hackers then managed to access. They then were able to hijack my Microsoft account and a couple of others with poorly thought through 2FA. I called comcast to explain this exploit and see if I can disable it and basically got someone who either didn’t seem to understand the issue or was trying to game me, asking personal questions and wanting me to verify a pin that “no Comcast Representative will ask for”. I need to speak to a human, preferably someone in the US, that is with Comcast InfoSec.