What is TForce and how do I contact them with my account questions?

Terrible customer service especially Monique who gave me wrong information and sold me free line with SE phone half a price on thanksgiving day. I saw my bill that T-Mobile charge me $50 more. I went on Saturday and talked to Monique. She said you have the cancel the line and pay full price of phone. I did not believe that this is the same person. I said do you remember me? She said yes but unfortunately you are not eligible for free line and I cant help you. I was shocked and asked her call your manager to fix it. She refused and I was on T-Mobile line for one hour and thirty eight minutes. Finally after four hours talking with customer service he recommend me send back the phone. That's very very frustrating experience for me with this store located on 105 E Alameda.