This shows so many gross misconceptions and with such utter conviction, I’m not even sure where to start. And as you seem to have decided you like to get free stuff that is the result of AI trained off the work of others without them receiving any compensation, nothing I say will likely change your opinion because you have an emotional stake in not acknowledging the problems of AI.
So this is likely one of two things: a clog in the line or the sewer line between your house and the service is broken. You didn’t say how old the house was, but the older it is, the higher the chance the line is actually broken (especially if you have any drainage issues near the foundation or foundation settling issues). No matter what you’ll likely need to figure out what the issue is first by having it scoped and then figure out your next steps. Hopefully it’s just a clog!
Source: had a broken line in a fifty year old house. It was awful and definitely not cheap.