You can un-distort it in Photoshop if you need to.
Where's the light that's causing the glare coming from? Is it the flash on your camera? Assuming you're perpendicular to the wall, it would have to be, or directly behind you, which means you could block it with something like umbrellas or a backdrop or makeshift curtain or something.
This sort of situation comes up from time to time for any photographer who's shot long enough. Reflections on walls, windows, etc., are nothing new, and we rarely have the option to paint over them with flat paint (and most of the time that wouldn't actually solve the problem anyway), so we deal with it using control of the lighting, especially the angles.