URGENT: Slid.dum intrusion into my saved passwords in Safari

I've seen other discussions about this, and let me tell you something: You are VERY sloppy, AT&T. You are the only company that has EVER changed my username and messed with my login information, and I want to know why.

When I logged into my account today, Safari didn't display my usual username as an option (with embedded password). Instead, I saw my username followed by "@slid.dum" and panicked.

We were hacked recently by someone who has been threatening me. I cleared absolutely everything out of my computers, reinstalled the operating system, changed all passwords, and now browse with Safari's privacy window.

So I'm sure you can imagine the fear I felt when I saw this username. This is a serious matter, and I expect you to immediately investigate this and REMOVE this from my account. You are AT&T, not slid.dum, and that's what I expect to see.

Safari never displays my username as an email address, unless I'm required to use an email address and that's what I save to Safari's passwords vault. You are inserting information into my private computer that has nothing to do with me. I don't care if you use .dum files and that somehow there's a legit explanation for this.

You are NOT to ever do this to me again. I consider this a grave violation of my personal safety, my personal computer and my expectations of AT&T. Considering recent large-scale hacks, and the fear I've been living with ever since the threats and hacks that targeted me, I do NOT trust "slid.dum" . . . for all I know it could be a gateway for hackers to embed malicious code in my browser and computer.

I want assurance that this has been escalated to your engineers and that it won't just float around in a customer service center and be ignored. You have caused me extreme anxiety, and I expect this to be immediately addressed.