How long does it take for Blizzard's World Of Warcraft Billing and Account Management to email you back?

Because its been 3 days :[|||it took them nearly a week to get back to me. im sure youll have something by sat.|||i would just call them becasue i had the problem they send back that much so i would just call them and tell them your problem|||same day usually check your account on WoW and make sure you have put in the correct email address