help with resetting password

here's the problem. For some strange reason my Microsoft account decided that the same password I'd been using for months was the wrong password. So, next up, the automated system steered me to a page to change my password. Except, the phone number they have on file is an old number. There was, thankfully, an option to use a different verification method. But, when I clicked that option, it took me back to the form asking for my phone number. So then, I noticed a link I could use to change my password via a form. It has been at least since Dec of 2021 and no matter what information I provide it immediately sends me an email saying that information was not sufficient. It's like some bad sci fi movie. The information that the system asks for is not sufficient ? Neither can I find a live representative either by phone or even chat. The information in my account is needed because I'm currently involved with a legal dispute. The computer I was using forced me to reset to factory setting . I was able to change every account except microsoft