Need HHELP with image retention my my new LG

Hey I bought an LG 50PS11 3 weeks ago and I'm having some image retention issues. I had the tv settings set to what it shouldn't have been, having not known the proper settings at the time. I had the tv on 100% contrast and the ISM method on Normal, not Orbiter. I was playing a video game for quite some time over a few days and I have image retention from the static logos that were in the game. I tried to white wash and colour wash the screen for a few hours but the image is still there. I want to know if these images will go away and if I can do anything to get rid of it. I even put it on a snow channel and it didnt help at all, it actually looked a bit worse.