T-Mobile customer service( or the lack thereof) and coverage sucks!!!

I finally have been awakened by my blogging hiatus. By the most horrible customer service I have encountered in years - from T-Mobile. And to think that they have pretty much the worst coverage as well. Here is the dope. I got a t-mobile smart-phone from Chicago last year. Since I got a new number, the plan also provided for a new free phone for my wife. Guess what- she did not get the phone for 3-4 months and I had to make several calls before she got her phone. Now we put that problem behind us and continued sticking with t-mobile even though there was absolutely no coverage at school. T-Mobile has brought over Suncom and the coverage improved marginally in the area - but still there was NO COVERAGE IN SCHOOL!! Things came to a head when I realized that I have been missing recruiter calls and potential job opportunities because of t-mobile's bad network. Therefore, I called them up to cancel it but guess what - they put the blame on me for not trying to use the school-provided wi-fi to try and get a better reception- WOW!!! Their point was - you know what, you have to pay us $400 to cancel since you are on contract - even though you do not receive calls in the building where you spend most of your time in. They say, you should use your schools Wi-Fi to connect and get better coverage. I do not get their point. I do not get the service I pay for. And they expect me to connect to a resource they don't provide to get better coverage? Can I sue or complain at consumer court? Can someone help/advise here?