Nice useful post.
I also search and contact my well reputed websites that are known as high brands and i contact them through each and every available resource however they can't respond to my mails and sometimes they contacted me when i left that thing and purchase an alternative for that. that is their customer service on which we all advised to stressed hard. anyhow its a shameful for those webs who are not responding to their customers problem after selling their products and also shameful for those who are not providing any customer support about their services or products.
your post makes me hungry to write three to four pages about different branded sellers who yet not respond to my mails however i stopped myself because it will began a war.