Poor service, constant lies and forced to deal with overseas lying agents

This is the only opportunity I am going to give Xfinity Mobile to do the right thing before I have a demand letter sent to you.

I have had my fill of the constant bold face lies that are told to me by your illegally offshored "customer service" staff, aka lying, bullying extortionists. I chat in and ask for assistance with an issue, have texts to prove that I was told that the matter was resolved, only to find out that I was bold face lied to by someone who is only reading a script because that is the only English they know. Then they launch into the extortion script, followed by more lies and bully tactics when I request to speak with a US based agent. Oh right, I forgot, those apparently don't exist. 

I want someone who has the authority to do as I have requested to direct message me and fix the problem. If I do not receive assistance, I will have no option but to send a formal demand letter to have my demands accomodated.