If you opened the drive (or removed the sticker) your warranty is void. In fact I'm sure it actually says that on the drive somewhere.
I found Samsung warranty RMA page in 5 seconds on google. You had no reason to even contact Ebuyer considering you bought it from them over a year ago.http://drive.seagate.com/content/samsung-en-us
Not sure why you would do something that boneheaded when it's under warranty. Looks like an expensive mistake with where hd prices are right now, good luck.