Doesn't explain the failure to respond to the messages though...maybe the webmail is not working - are there any email addresses on the site?

It is www.pinled.de
most of the contact stuff is in German and/or has not been filled out (eg phone is 0800,000,000)
there does not seem to be a contact email except though the site

I will contact them a third time tomorrow (don't expect a reply on a weekend)