Thanks Lavenia. I was finally able to chat with a support rep. unfortunately she wasn't much help. She says since my laptop is out of warranty, I just have to purchase a new adapter. She claims the adapter is not defective because it worked during the warranty period. It doesn't make sense to me because the issue did not arise as a result of wear and tear or usage. It is obvious the product is faulty. And I found a few more posts with exactly the same issue with almost identical pictures of melted charger connector.
I expected better service from microsoft....