ATT says I owe money from an account, but I've never had one till recently
I moved into a new apartment that uses att fiber internet. I called to set up an account, and I was told I have an outstanding debt of $600+ dollars from an account in my name already. This is my first ATT account, so I think someone has used my identity. I got mail at my parents house when I was younger, but I thought it was all spam/fraudulent so I ignored it. Then I saw it on my credit report, disputed it, and it was removed. But ATT still says I owe them money. How do I go about this? Can I submit a case?