January bill not showing service change. Need accurate January bill

Disconnected TV service on Jan 3, so internet-only for the entirety of the Jan 4 - Feb 3 billing cycle. January bill still shows original TV+internet bill ($178.53) instead of correct internet-only bill ($74). I have disconnected auto pay so that I don't pay for service I'm not receiving, but I need to know how much to pay for January's bill.