They always charge me an incorrect amount on my bill.

How can you say my account is in arrears. I pay you every month and every month you send me a bill indicating I'm in arrears. I want this investigated now! I have had the same phone number and have been paying the same bill for almost 30 years now. When you guys migrated my landline to the unlimited call package I have had nothing but issues. So either fix this now or I'm calling to cancel.