Sorry to hear about this and I understand your frustration. But for someone to call "scam" based on a communication gap is unfair and potentially damaging. Lots of companies are encountering difficulties right now and Don Wentz is anything but a scammer.
Don was a contemporary of mine since 28 years ago when we were both building RV-6s out here in Vans' back yard and he developed his LL kit during that period. We were good friends and helped each other with building, flew to OSH together, participated in FF training and airshows, fly-camped in Canada and other places, organized and participated in fly-ins, co-ran the local builders' group, and many other things. Don developed the LL kit as a small side business and sold many many lights independently and through Vans. I have two Duckworks lights in my -6 starting with halogen and later upgraded to LEDs (two different iterations). My last upgrade was at least five years ago; I'm sure what's being sold now is different but in any case I've never had a problem with heat in about 800 hrs of running with LEDs. I run them a lot, mostly on wigwag.
As for the current communication problem, I can't say as I haven't been in touch with Don for quite a while. Regardless, I am inclined to defend his integrity as he's definitely a stand-up guy, I can only speculate that there's some difficulty on his end that's interrupting the business.
PS: From the posting rules: The forum is not intended to be a mechanism for people to vent frustrations about vendors or sales from private parties. Please settle your differences with sellers, manufacturers and dealers through the long-established legal or arbitration systems or the Better Business Bureau, not through our community.