Back brake disc is wobbling forward and backward and side to side

[Tom Ball]

My back brake discon on my 00' blaster 200 is wobbling and is sloppy as hell when I ride it squeaks because I beleive it is warped but the splines on the axle appear to be in okay condition but the price that holds the disc on looks a little crapped out but still good I don't know what to do should I order a new axle and hub and everything or is this fixable it has gotten worse with time