I paid for my midi guitar and did not receive the product. And I can’t find any way to communicate this to the Jam Origin website. How do I do?
Hi @Guttemberg
These kinds of issues are usually handled via support@jamorigin.com
But to be sure we can also let @JamO know here as well! 
What product are we talking about here? The MG2 software is a download as a demo and the thing you get when purchasing is a license file. Is it the license file mail you are missing? Be sure to also check your spam folder, if that is the case.
I just replied to you with a private message.