I've collected enough Casio phone #'s over the years to take up a GB of hard drive space. Yes, they are very difficult to get information from. Very polite, but DIFFICULT! I never seem to get a professional person to talk to. Usually end up getting my info from whatever operator answers the phone.
I think I used one of these but I can't be sure:
800-836-8580 (musical instruments) 800-706-2534 x 4 (customer service) for Technical support in USA call 1-800 435-7732
It will probably be an exercise in futility,but I think my best chance at obtaining any pertinent info,would be via their direct sales line(800-836-8580).