IPhone 6 Help (Disabling Lock Mode)?

Well okay so I bought an iPhone 6 from Ebay for $450. (Yeah yeah I'm not smart) anyway, when I got the phone in the mail it was good until I turned it on. When I turned it on it said: "This iPhone is lost. Please call xxx-xxx--xxxx." which means that the device is in "Lock Mode" and is completely inaccessible for normal use. This lock program is now a new thing for iOS 7&8. So now everytime it is turned on, the phone sends and approximate location of the device to the original person in which the phone was "bought" from. So apparently the person who sold it to me stole it and that's why they sold it to me for such a low price. So now I wasted all my damn money on a freaking useless brick.
Does anyone know how to fix this or disable Apple's "Lock Mode"? I just don't want to turn on the phone because when I do, it sends my location to the first original owner that the iPhone was apparently stolen from. Does anyone know what to do? I literally spent all my money on this phone and I really want it to be worth it.

Go to apple store

Nothing much you can do but return it to the owner. If they pay you some thing for doing so, than consider it even.