Does it make any sense for my cell phone bill to be steadily charging me $200 a month after it's been turned..?

off? I mean, DAMN! I know it' s because of the service contract, but it's like they thought of a way to constantly charge you for not having the money to keep the phone on. How are they allowed to have contracts like that? My bill got up to $200 a month with three phones on the plan, but the bich has been off since November. My latest bill in the mail showed where I owe T-Mobile $900.00, and the total is steady increasing. Anybody can relate to this bullshitttt?