Help with cell phone

I have been on the phone for 5 hours today trying to activate a new phone and there is an issue with an old email address on the account. 5 HOURS, twice I have asked to the for a supervisor and been put on hold for twice twenty minutes. All I want to to get a new phone activated, should be simple. Both time when I asked for a supervisor the "customer service" people kept trying explain to me why they cannot help me over and over. I am beyond frustrated after being a customer for over 20 years. I dont want to go to a store as even if I have an appointment I have to wait. HOW CAN I GET HELP?