I signed up for a free trial and was disappointed in their service. I decided to cancel within ten minutes of signing up. I googled the company and was rather worried from all the complaints that cancellations were more or less impossible. I was also rather scared when I pushed the "cancel account" button on their website and a box popped up telling me I had to call their toll-free hotline during business hours to cancel the account (they were closed). I read the contract and it states that during the free trial period cancellation requests can also be submitted via email or mail gives a sample cancellation request. I submitted the sample cancellation request via email and received an email confirmation that my account was cancelled the following morning... I'll post if I have any trouble down the road, but so far I can't complain.
Their email address is *******@usenet.nl. Just send them a message of cancellation with your account number. Should take care of it.