I bought both my Helios and my Zeus used and I just checked the paperwork that was sent with them and I donāt see an email address anywhere. That said, I would email Linsoul since they are the ones behind HarmonicDyne from my understanding. They should be able to point you in the right direction.
Edit: Totally forgot that I was reading search results and that this your post was several months old lol! 
I can be a bit slow sometimes so youāll have to cut me some slackā¦