My T-Mobile 5G hotspot works quite well, but billing has been an absolute nightmare.
Several months back, when I still had a credit card, I requested my billing date be moved to the 19th (from the fifth) of each month, as autopay on the card hit on the 18th. After going through the whole "this month will be more expensive, as you'll be paying for six weeks," which I was fine with, they tried to take payment out on the 17th, and -- lo and behold -- it didn't go through.
I spent six hours on the phone with them to try to untangle the mess. One representative said I needed to cancel my account and dutifully did so for me without my consent. The ensuing bullshit ate up the better part of the day, as I tried explaining I don't want my account closed, and rep after rep said it couldn't be undone.
Eventually, I reached someone who apparently could reverse the cancellation, but holy fuck what a nightmare -- especially since when I signed up for service in 2023, my credit score was in the 700s ... starting a new account with a score in the 400s would have meant a hefty deposit I couldn't afford, as well as having to return the hotspot via UPS so I could eventually get a new one.
There is no earthly reason that taking a payment out before what I'd agreed to should eat up an entire business day.
I hate that this is how our legal system has evolved. Trial courts mean nothing when a corporation loses, because invariably an appeal is filed, and if the circuit court upholds a ruling, well, time to talk to SCOTUS.