Speechless at the horrible customer service recently

I just spent 3 hours chatting with 6 different reps with no hope for a resolution on an issue that THEY created. Long story short, I can’t log in to my mobile account. I have xfinity internet at 3 different address plus two mobile lines. I’ve always tried to keep my login separate between internet and mobile to avoid this issue, but they keep linking all of my accounts without my knowledge or permission and when I try to login to my mobile account it just tells me I’m not a customer. They tell me that they just need to create separate logins for each. Great, do it. That’s how I wanted it and had it before. But nope. The first 30 mins is always spent just trying to verify my account, the next 30 minimum is them trying to understand the issue. Then, the next hour is them trying to figure out how to fix it before finally giving up and transferring me to specialist that they promise me can fix the problem. Which means starting all over until that new person give up and transfer me to someone else that will take up an hour of my time before transferring you again. Funny thing is, they all start out by saying “you’ve gotten in touch with the right person, I can fix your problem.” Is this somehow their business plan?? I’m serious because it’s the same thing every time and I feel like such a chump for letting them do it. It’s actually heartbreaking. They used to be the best, I would brag on them all of the time to anyone that would listen, but things have recently changed, suddenly and drastically. Has anyone else any of these issues? I’m ready to switch carriers ASAP but I don’t wanna end up with a company that’s even worse! Does anyone have any recommendations?