Instruct: Classify Amazon reviews into positive or negative sentiment
Query: T-Mobile Sucks

I use to be a t-mobile costumer until they started charging me for changes i made to my plan that they didn't change.I called costumer service and they gave me the run around.I had two lines and changed one of the planes to a emergency plan for 100 mins a month.It was suppose to be changed at the end of the pay cycle.Low and be hold i get a bill for over 1,000 dollars. I'm like WTF. I call them and they say they changed my plan an hour after i called them to change it to an emergency plan. I was so mad because it was soppose to be changed at the end of the month taht was the agreement with there costumer service. I've been trying to get them to drop the overage charges but they say it is my fault for chabging my plan. That is not the only problem i had with changing my plan this has happened befor ewith them. Finnaly i got tired of them and went to cingular which costumer service is best.