why TMobile home internet so bad

I agree mine worked good for a while then it started to suck I went to cancel and they said it'd be cheaper to go another month because apparently you pay a month in advance which is dumb, Verizon offers faster for 15 less and quantum offers way faster for $15 more. Save your money and go somewhere else not to mention I've had to get a new gateway a week after my first one because the model was not longer being used and they tried to charge me. This internet is not worth it at all! I got the same speeds through century link in the middle of the mountains then I do with this in downtown Denver