My phone bill is supposed to be paid off, but they're still charging me for the service plus the pho...

My phone bill is supposed to be paid off, but they're still charging me for the service plus the phone itself, and the price has gone up to $287 !!!They're crazy! The worst company in the world !!!!! My contract didn't say I had to pay so much. They've charged me for many things I never authorized. These people are crazy. Who pays almost $300 for a phone service? They even told me I approved international calls, which never happened. I never made international calls