One thing that works for me is to send a few messages describing the incompetence of tech support to the company's executives. They typically don't like to be bothered with such email, but can't really ignore them. I usually google private company contact information and use edgar online search for public companies' records. Propellerhead is a private company. I believe the executives are as follows:
CEO - Ernst Nathorst-Böös
Marketing Director - Tage Widsell
Public Relations, US - Marsha Vdovin
Marsha has a public website with her private email and phone number listed on it. You can google it.
Tage's email address is
tage@propellerheads.se (from a google search). You can extrapolate the others from this.
If nothing else works, you can try variations of first and last names to determine what the correct email address format is. Once you do, send your message to them.
Good luck...