I've been to Amianan Baguio before and almost all of their display units there are in good condition.
I'm just confused why they have to give you such unit in bad condition (as you've stated).. in the first place, bago bago pa lang sila (they used to be dealers of Kia and Hyundai) and such move (of selling such unit) would definitely hurt their marketing and brand image...
Just don't make sweeping statements against Chinese brands. Your experience does't always reflect the quality of their products. Give them time and they will definitely improve. Peace brother! Hope masettle niyo na yan without th expensive legal proceedings.

If you have some pics, maybe you can post them here too..