According to them, they can bill me literally forever on the account I've already fucking cancelled once, for the product I didn't fucking want in the first place, even without a fucking valid credit card.
The first thing you need to do is stop letting them walk all over you, and use federal debtor laws to start fucking them.
I hope you didn't talk to or admit anything to debt collection guys. You should immediately send a letter requesting Debt Validation (I've used this
one before) to the Collection Agency (I assume they are reporting on your credit report). Send it certified mail with a return receipt. Give them 30 days to respond or remove their negatives from your credit report.
While you're at it send letters to 1&1 also asking for Debt Validation because they probably have shit. Make sure your letter states they are not allowed to transfer the debt to another Collection Agency. It's a pretty common tactic that if you request Debt Validation, the cock suckers just send it to another Collection Agency to start the process again.
If they don't respond or don't remove the listing within that time frame send letters to all the Credit Reporting Agency asking them to verify the debt. They will be verified pretty much no matter what, because they don't really do fuck all. Gotta give them 30-60 days to respond.
When they respond that they are verified, once again send a letter to the Collection Agency stating that they have provided no proof you owe such a debt, and that they (the Collection Agency) actually verified the debt to the Credit Reporting Agency. Give them 30 days again to respond. If they do not remove the listing file a small claims lawsuite in your locality. Fuck them on a variety of laws, collect a nice pay check. Fuck these cockroaches.