T-mobil is unfare and rediciouls Colorado springs, Colorado

i had an account with T-mobil company. i had problem with getting inter net signal,so i would lose it whenever i go on line. i report the matter to T-mobil custemer cervises. then to T-mobil tecknical specialest.nothing was done to fix the matter over tow months. i was paying for service that i do not get.so i decited to cancell the internet but i was going to keep the phone line till my contract over.i was told by the custmer services that i can't drop the internet,i have to have it through out the remaining periot of my contract.so i proke the contract becuse i don't want to pay for something i don't get.T-mobil is after me to pay $200 for breaking the contract.Inaddition to, i was charged an aditional $110 as a rip off. i need your direction please. thank you very much