Wrong bills, every T mobile representative gives a different answer, how to get a person in T-Mobile who can solve problems

I've had it with the chatbots and chatbots masquerading as humans. I have always had autopay but recently switched banks. Should not have been any disruption in payment. All of a sudden I was getting texts about past due amounts for over $300. I have cell & internet, so that's two months of service. Bizarrely, they had processed a scheduled payment just a few days before these late notices started showing up. And, they had started bi-weekly billings! Nothing I had ever authorized anyway. Chatting with the idiot "human" who claimed to be Marybeth (Marybeth Chatbot I am sure) was like talking to a dead bird. So stupid and unable to even comprehend the questions, yet supplying irrelevant excuses. I repeatedly asked her  for the phone number to Customer retention. She refused! T-Mobile has absolutely no customer service numbers on their website, despite being a telecom! How hilarious! All I can say is that T-Mobile employees should be ashamed at how they treat people. They should be forced to get a T-Mobile tattoo on their fac so that when I encounter them, I'll know how to ignore them too.