To call the California Franchise Tax Board, all you have to do is call 800.852.5711.

they can answer most of your state taxes questions.

the California Franchise Tax Board is opened Monday - Friday
the hours are 7 a.m. - 5 p.m. pacific time ofcourse.
they are Closed on state holidays, satudays and sundays

but their Automated Support system is available 24/7, the automated system number is 800.338.0505

if you are outside of the U.S.A. then you can call (916)845-6500

why do you need to contact the FTB?