My assumption would be that this was done through their setup CD, which comes with the modem. However, the ISP's software is not installed on their machine (I don't trust it not to have snoop-ware), as I had their machine manually registered through a web-interface (which did not indicate contracts at that time, I am not sure about now).
Despite this, calls to their hotline have indicated that they will not rescind the cancellation fee. Moreover, the last operator from the 'Loyalty Department' I talked to refused to separate the internet bill from the phone bill despite being told they would no longer be authorized to bill the given VISA account (they said they will not change that billing process unless given another account, and refuse to just 'send a bill' in the mail). When I questioned the legality of this the operator told me to 'get a lawyer and have them contact the legal department.' Obviously, this is an option but seems rather to be a bit extreme and I'm sure the company realizes it. So what does one do when a big company is bilking pensioners with contracts they have no proof of? Certainly there are no signed documents, and whether a particular button was clicked or not seems to have no proof except in the ISP's say-so, as well as the dubiousness of button-click legality under local law. My next step will likely be to explain the situation to VISA but then things can definitely get ugly as the ISP is also the local telco.
By the way, this is in Canada, so Canadian law would apply, but I would definitely appreciate suggestions as such cases seem more and more common."