T-Mobile USA review: Phone service

I am a former Tmobile customer and after many months they have been unable to get my phone/service up and running and my phone hasn't worked properly for a very long time. Tech support never followed up to figure out why I can't use the phone, why it keeps freezing, will call from a google number instead of my actual phone number preventing me from being able to conduct personal and business communications. I gave them ample time to fix this and not one time was anything fixed, rebate of bill, NOTHING. So I left and simply want to mail the phone back to them, as it doesn't work. I will NOT pay for a service that doesn't work and they could care less about fixing any issue and think I'm going to continue to pay this bill. THEY are in violation of the terms of the contract not me and as a journalist I can't be without a properly working phone. I'm done calling dozens and dozens of time to coporate and been to the store more than that and NOTHING was resolve.