Eircom Cancellation charge €510! I dont remember ever setting up 12mo contract.

I'm having a similar experience to Pat and Berginhart in that I may have inadvertently entered into a new contract with my service provider (Eircom in my case) through upgrading my broadband service and am now faced with early release charges totaling about €300 following a switch to Vodafone. I have asked Eircom to show that I am contractually obliged to pay the early release charges and how they have been calculated. While I am waiting for a response I wondered whether anyone is aware of any challenge to such early release charges on the grounds that they are (a) punitive and therefore potentially unlawful or (b) anti-competitive?