There are numerous complaint threads over at Antique Radio Forum. The answers are always 3 months plus if you are lucky. The guy doesn't answer email or reassure anyone, so there are many like yourself . They say you will eventually get it, but there's no set time. Many people have become upset by this business model, so you're not alone.
I built a kit from Antique Electronic supply using a 12 SA7 vac tube . It stays on just about 24_7 , I am quite happy with it , it does fine, but doesn't have the extra features of the SSTran. I can direct you to threads using a 386 chip that they say is just as good, although it DIY.
I can't say what's involved in getting your money back, I think you'll have to wait it out.