One thing for sure, the less we share these sorts of experiences the more this lets them get away with it. Jungson refused to honor their warranty even once they knew for certain their amp was defective- because they had seen and heard it themselves! Then instead of replacing it they stopped returning my calls. I will never buy Jungson again and take every opportunity to let people know, so they can be informed and make up their own mind.
When you complain about something without telling us who and what and why all it amounts to is a "waaaaa!" Everyone knows how bad customer service feels. We have all been there. This is going nowhere. Tell us who, and give us the details. A lot of these guys watch the web for stuff like this. You help us by warning us, help them by letting them know, and help yourself if they decide to do something about it.
So: Who is it and what happened???