T-Mobile as given me 5 bad handsets!

I have had 5 handsets in the last 3 months and still do not have a model that has the same functionality that I was originally promised. Was promised 200 anytime minutes as partial compensation & was reneged on. I would like to get out of my contract since they can't meet their end of the bargain - they want to charge me a total of $600 in early termination fees!! I just want a phone that works as originally advertised - nothing more.