What is the best way to deal with Samsung's customer service?

[The Bad Guy]

I purchased a 61 inch slim fit DLP TV last December from Samsung. It had a bowing issue.

I returned the set to get a new one through the site I purchased because Sammy said basically that it could have been damaged from shipment.

Well, the new one bowed as well. This one was actually worse, but Onecall.com said I would have to deal with Sammy on it because it's a design issue.

I've called Samsung 3 times over the last couple months. The last 2 times were to get techs out here to fix this problem. The techs said there was nothing they could do to fix it. The bottom two ends are bowing down because obviously the weight isn't distributed properly in the casing, which is causing the bottom of the screen to be curved. It's not a huge issue when watching, but I worry about the problem when the warranty is up when it keeps bowing to the point that it damages the TV. Samsung refuses to even say this is an issue, but upon a simple search on google, tons of people report this problem.

I talked to Samsung last week and told them I wanted to exchange the TV for a newer model that doesn't bow. I'd like the bigger model, and am willing to pay for it, but I haven't had positive conversations with them.

If they refuse to do so, should I contact my credit card company and have them go after them? I've never really had a major electronics purchase like this be a problem so any help is appreciated.