Denied service

Been an AT&T customer for 6+ years, 4 wireless lines, perfect pay history (NEVER been late with them and excellent credit, I have zero past dues on any accounts for all 3 major reporting agencies). I ported over all my lines in the past few days to another carrier (lower prices) and the last line i cancelled yesterday. I decided to reopen the last line since it was an Applewatch wearable that my current provided doesn’t support (i didn’t know that at the time until it was too late). At&T denied me reestablishing  my same Apple Watch line and even setting up a brand new line with a new account. Why .. Fraud Department said they couldn’t verify me, despite me answering all thier invasive questions, providing my driver’s license number, etc… They couldn’t verify an EXISTING customer of 5+ years who only just closed their account the day before. And they absolutely refused to tell me why, given me any hints or indication of what information provided was incorrect. My address, ss#, dob, phone number they asked me to verify is litterally the exact same information on the credit reports (i reviewed all 3 bureaus that same day while i was on the phone with them) and the address and DOB is the exact same info on my driver’s license I provided to the AT&T store i went to later today and spent 30 minutes trying to understand why the Fraud department can’t verify me. I was on the phone for 3 hours today talking to various Customer Service and Fraud supervisors. This is the most ridiculous and egregious experience I’ve ever had as a consumer, particularly for an existing long-time and excellent paying customer, much less to add a trivial $10/month watch line. I will NEVER recommend AT&T to anyone and will share this experience with anyone i can to save them the trouble. With how adamant the Fraud department was with not being able to verify me, even with me being at an AT&T in person with my ID, were they purposely denying me credit / a new line out of retribution for porting out my other lines?????