Your sample is scientifically insignificant. That's like saying a potato chip in your bag is broken, so thereforee, the entire companies product sucks lol.
Best in 2007:
Scroll to the bottom to see the graph. Also note how it says that "T-Mobile Ranks Highest in Wireless Customer Care Performance for a Sixth Consecutive Reporting Period", i.e., for 6 years!
Actually, AT&T moved up in 2007 but in '06 and '05 they were second from the bottom (didn't look up the other years).
LOL. I didn't even know this existed, I just searched the web and found it.