Um
Revert the last firmware? You imaged it before you flashed,right?
Take them to small claims court. It worked for me 6 times in years past when I had to buy their shite. It is the only thing that they understand.
I was once told to wait for an update that never came. When my unit went out of waranty, they then told me to buy a new one. The funny part was that they were also pulling the same stunt on the judges wife... It still makes me laugh to this date.