Hello, for non italian there is the google translate :
"do not buy from this Thai seller WIZARTSPEED is dishonest"
From my experience, i bought a dual exhaust from theire shop and it was all good.
The delivery was really slow but considering it com from thailand, nothing bad...
The exhaust was a slightly low quality but really acceptable considering the price.
Have you tried to talk with them ? You have to be patient with them, they're not really fast but the job is done I think...
You should explain a little more what happened to you instead of giving them free bad publicity.