Save yourself $6 and do it by e-mail. Just find the abuse e-mail listed for the IP/Host and 99.9% of the time they'll take care of it in 24 hours or less.
Registered post is much muc less ignorable than email. "I didn't get that email" is an excuse they might give, but you can't say that with registered post. For the sake of $6 it's worth it.
I've had someone try (For a $1000 insurance claim against their business). I didn't mention it was registered post until they claimed they didn't get it.
"Oh, really? Well the registered post office said that there's a signature on this from you, and it was definately hand delivered."
Exactly my point. If you had sent them an email, then they could keep claiming they never got it. Registered post is an ace up your sleeve that you can pull out when you want to catch them with their pants down. You now have record of them misleading you. If this goes before a judge, that counts against them, since they are playing dirty. Registered Post saved the day, all for $6.
