Usenet.nl, director Marco Carlini in San Marino, are swindlers.
They fool you into a trial period subscription, while promising you can download rare books from their site, and after you've filled in all the inscription information, you'll find out that they don't have these books!
Then you fill in a terminationform and receive a message that they have 250 or 325 other messages to answer and that you must wait 16 or 21 hours before they answer. Of course, they will never answer! They hope you forget about it.
So, send them (within 14 days!) a letter (by registered mail!) to San Marino (Via palma il Giovane n. 21; 47895 Domagnano; San Marino) that you want to terminate your trial period, otherwise they'll try to steal 100 euro or more from your account.
If your registered termination letter doesn't have the wanted result, you can request your bank or PayPal to reverse the stolen money. Don't forget to ask PayPal to finish deals with these crooks!