I've sent at least 3 e-mails to Riverbelle without any replies so far (a couple of days later) Is this normal or a bad sign?

well depends on what you talk about in those emails :D

Hi there,

Sure they do...

Do you have the correct e-mail address..

The one I have is captain@riverbelle.com or call them at USA: 1-888-615-2383..available 24/7