T-Mobile Lied about price of phones, and service. Nationwide

I just finished off my Verizon contract, and was excited to shop for a less expensive cell phone service. I have heard T-Mobile is not quite as good, but their prices seemed better than anyone. I called and spoke to a nice young woman who said I could get 2 lines, smart phones, unlimited talk, text and data (slowing down after 3 gigs per phone were used) for $70 a month including all taxes. She also sold me two LGG2 new phones, and came down in the price from $254 to $200 in a heartbeat, without me even asking. To finish the transaction she sent an email, which I ticked a box to accept the terms, and sent it back to t-mobile. A few days later I got my bill. It turned out the price for the 2 lines was $80 + $20 (data upgrade charge) plus tax, so about $115 for what I was expecting to pay $70. ALso T-Mobile charged me $254 per phone, not $200. I called and they said they never sold a plan like that. I asked to speak to a supervisor, and she said the same thing, and there was no way they would remove the $110 overcharge on the phones because I had agreed to the terms (17 pages written by a team of Philadelphia lawyers). I reduced my data to 1 gig high speed, slowing after that is used to unlimited, reducing my phone service to $80 + $15 tax= $95 a month not including the cost of the phones.

I should send everything back, but I'm just tired. The corporation has worn me out.