[martinald]

What if they affect your credit record?

May be different in the US, but if you did that in the UK and they didn't read your email or whatever, you're likely have them sell the debt to a collection agency which will then place a marker on your credit record.

It's then a huge pain in the ass undoing the credit record mark. I still have a default on my record thanks to the cable company here not cancelling our service properly. They even sent an courier to pick the equipment up but despite a trillion emails explaining this they insist they can't do anything about it because they have sold it to a collections agency. What a load of gibberish.

[nommm-nommm]

Yes, they can (and sometimes will, depending on the type of service) keep billing you, and then eventually send you to to collections if you didn't actually cancel your account.