Back when I still had dial-up, Ameritech suddenly charged me several hundred dollars one month. Their story was that I was using my 'voice' line for dial up - to a local number. I said they had no right to tell me 'how' I could use my phone. They said they sent a letter and named the date - which was AFTER I had already purchased the service. I told them they couldn't change the terms of usage AFTER the contract (purchase) was agreed to (agreement being they provided a service and I paid the bill). They agreed to 'discount' the dial up rate. I said not good enough - I'm not paying ANY rate as they were local calls and part and parcel of my monthly service. It took a long time but I fought city hall and won. Shortly after that I canceled my land line cause the local cable company offered internet service so I went with Vonage.