Misled twice causes financial hardship

I've been reading quite a bit of these situations and I believe T-Mobile should be held accountable for their wrongdoing. A Business shouldn't be this shady and unprodictable. It's a shame just how careless they turned last few years . I was a victim of such false promises by "MANAGERS" yes "Managers" from T-Mobile and given a promo deal due to the fact of "lack of customer service " exactly you read it right, I'd call because my previous phones internet  wouldn't  be working half the time and would, I say about 95% of the calls this " -think we found the problem Michael, the tower that your sevice is receiving signal from is under maintenance?" Only problem was by this time this was #1 answer on the screen I'm guessing since it was almost 8 weeks at that point . Called T-Mobile out on it , and wanted out however manager as long as a second manager /supervisor approved of an upgrade promo which I didn't have to pay iPhone SE 3 . But month later bammm. Get charged and till this day marks a year September 2023 and still issue not fixed. Been lied by 5 managers ,4 supervisors and about 5 reps it's just a damm shame with T-Mobile I really wonder what happen to this business , what happened??