I get my DSL service from Sonic.net who are excellent! However I just got my bill and I happened to notice that the rate went up a bunch. I called and found out that my 1 year contract expired and the rate reverted to a higher standard non-contract rate. I called them and signed up for a new contract and they reverted the additional charges - no problem!
So keep an eye out for the end of your Sonic.net contract! (I imagine this applies to other DSL/cable providers, as well as cell phone providers.)
Barry