I can’t reset my password

I've had two accounts linked for about 6 years, one personal and one professional, and I always got into the professional account through the personal one. I've long forgotten my personal password and have tried filling out the password retrieval questionnaire, but since my details have changed so significantly in the last 6 years my request was declined. I then tried calling Microsoft but was told I had to go online to 'Live help' in order to find a solution. So I went on the live chat forum, explained my situation, and was sent a forum link with an ID number and was told to wait for up to 24 hours for a response. The next day, I had multiple emails from the forum saying Microsoft had replied, so I clicked the link, signed in, and was told I was unauthorised to view the incident. After trying this a few times only to find there was no way I could possibly view my own forum, I went back to live help and explained the situation again. He assured me the problem would this time be fixed and sent me a forum ID number, like last time. This morning I again had multiple emails saying I had a response from the Microsoft team, clicked the link, and found it to be a dead link. I then tried to click all the links I've been sent, and they were all dead. This is getting ridiculous. My job requires me to have a functioning email address, and I can't communicate properly without it. I am happy to send in whatever proof of ID necessary to get my account back online.