The worst customer service

I've had service and interaction with MCI Worldcom, Comcast Metrophone, Cingular/ATT, Tello, Visible, Red Pocket, Mint, Boost, Ting, Ring Plus, FreedomPop, Tracfone, Straight Talk, Verizon, Sprint, Xfinity, and Metro wireless, maybe a few more. The worse has to be T-Mobile, with Xfinity being a close second. They are a nightmare.  Back when I had a Sidekick II, I loved T-Mobile, their customer service was great and coverage was decent. In the past 3 years it's been terrible working with them, I dread having to call them. I tried to setup a new line and after 45 minutes it was a dead end. Now I'm trying to port a new line to an existing account and it's been 2 weeks of calling with no luck. I walked into Best Buy, purchased a Mint mobile sim, set it up online and was ported and on their service after 5 minutes!!! 5 minutes!!! This is my third time trying to setup a new line on T-Mobile spending 1.5 hours after 6 phone calls.