Lie to customer

They called me offering me 2 new iPhones 16 pro max phones and a new family plan, which would total $177.00... I asked several times if it was right, the attendant confirmed that it was, I asked for an email confirming it, he said that this didn't exist in T -Mobile… after 1 month I was surprised that the plan was $246.00, I called to complain, the attendant managed to validate the call after a few attempts and apologized for what happened and said that the T-Mobile would honor the proposal and I would no longer need to worry. The following month I had the same problem, they gave me a credit so that the amount would reach $177.00 but they told me that the correct amount was $246.00... very confusing, each attendant does something different and nothing is registered in the email- email, they want me to pay the amount of $246.00, they don't want to accept the return of the device because 20 days have already passed. This is absurd, I was deceived and now they want to force me to accept and pay for something that was sold to me for 30% less... I'm going to look for a lawyer to help me with this process.