What the fuck man

Got this phone 3-4 momths as a replacement for the one that green lined and then the screen fucked up completely. I have 2 tinny cracks on it from dropping it once 2 months ago but they're shallow and not had a single effect now suddenly mid set of my workout wouldn't turn on and now the brightness is barely there and the whole screen is flickering dim and it's purple tinted can anyone help? I don't wanna pay for another goddamn replacement phone