You're welcome. Do understand that the troll or anyone else can get a new IP very easily so the concept of blocking IPs has had no validity for some time now. Moroever, when we block an IP as the IPS place hundreds of customers in the same IP block there isn't really an effective mead of blocking an individual person.
The most effective way of dealing with trolls is to fail to engage them.
Why allow one individual to control your blog visibility? I don't. I simply delete the comment and move on. Eventually the trolls get tired of being ignored and look for a new target.