If I were you I'd probably send it back. I just thought I'd mention that to fix a stuck pixel on my dad's old laptop, I had to massage other parts of the screen to get it to.. unstick.
I noticed that the guide linked above said you shouldn't because it can create more stuck pixels. If you really don't want to go to the hassle of sending it back then I guess you can try this, if it works great, if not or if it creates more stuck pixels you can still send it back.
Remember to use a lint free cloth or something similar when you do it unless you want marks all over the screen.
Leaving a blank white image on had helped previously, but until I did that massage it always came back, often within a few hours, now it's been gone for a few weeks, probably months come to think of it.