Getting account emails for a different account

For the past few months I've been getting monthly account emails (e.g. bill pay reminders, some marketing emails, etc.) for a totally different account that is not my account. It has a different number, different name, different plan, etc. Most notably the emails are in Spanish whereas my account is in English. The email address they are sent from seems to be a legitimate AT&T email address and they are sent to my email address, which is the same one my AT&T account is under. It almost seems like something is messed up in an AT&T account database or something, as my email address is fairly unique/unusual and it is highly unlikely that someone put it down as a typo. I've emailed and called AT&T support several times and they're always baffled and unable to help because they (obviously) cannot tell me details about this other person's account. I've tried emailing a few corporate email addresses for security/cybersecurity issues and never gotten a response. I feel like this needs the attention of a somewhat high level software engineer within AT&T and the frontline support people are unable/unwilling to make that connection for me. I'm at a loss of what to do, just hoping that someone with the ability to help actually sees this.