watch your bills

Today we received a bill from American Express and one from the phone company that both had weird charges on them. When I called about them, I was told they would cancel them and take it off the bill. But I still don't really know what they were for or how it got on my bill. I know we should always check our bills, but sometimes it gets by or we think someone else in the house bought something and don't ask. BUT ASK.....check your statements. Both places said I made agreements on the phone and I knew that was wrong, because I never agree to a charge by phone.