T - MOBILE unlimited internet is not unlimited sign on with tmobile Houston, Texas

I ordered unlimited internet from T-Mobile who I have been a cell phone customer for years with. Unlimited broadband was only 53.99 per month, as soon as I cancelled the service I got an unexpected bill for 690.00. I also have to pay a 200.00 early cancellation fee because I got internet through Comcast and didn't need T-Mobile service. I expected the 200.00 cancellation bill but not a 65.92 charge for just logging on to the internet again a 28.31 charge again a 48.00 charge ex. until I used my 690.00 worth of charges.  They say unlimited but they are not unlimited if you log on they will be charging you and they will not work with you even if you are aloyal customer.  Please do not get T-Mobile internet.