@tazekar there really is not anything else that you can do. You did right by filing an official complaint, but unless you find more people with the same issue as you have encountered, Samsung will not care much about this. Trying attorneys to sue etc. will cost you way more than the financial loss you have so far. Personally, I would continue to contact Samsung and "move it up the chain", always ask to speak with a higher supervisor.
You do want to let your family, friends and neighbor know how you feel about Samsung and how you got treated. Companies will only listen to the consumers when they experience a loss in sales. Sorry for your financial loss.