Bait and switch - misinformation from phone agent
When I signed up five new lines with T-Mobile, I was told by Deaven, the phone agent, that he could give me $400 off a new iphone "now" or if I go into a T-Mobile store that would give me $800 off. I went to the store and was told that the information was not correct and they could only give me $400. I then called costumer supports again, and was told that I misunderstood what Deaven told me. I then called back again and was told that not only was I not getting $800, or $400 of I was only going to get $175, I then asked to speak with a manager. She told me that I was eligible for "Keep and Switch" promotion, in which I would be able to get $800 for each phone line I have. She sent me the link to sign up, and said she'd call me back in an hour. I read the terms of "Keep and Switch" and she was incorrect it only pays for remaining balances from my previous carrier, so she lied as well, and never called back. I received a text asking how was my experience, and I gave 0 out of10, so today I received a call from another manager and after explaining myturmoil with her staff, she said, "I know how you feel, but there is nothing I can do." How do I go about reaching T-mobile cooperate to complain?