Missing Classes

[Kristal]

Could you list the job and skill levels for your characters? Characters can be rolled back, but it would have been asked specifically by you (the owner of the account) and it woould need a strong reason (such as someone obtaining your login data, steal all your gear and/or delevel all your jobs to 3, getting you banned for RMT, etc.)

So I suspect you are merely confused and mixed up your main/alt. (Alts usually don't level advanced jobs. Maybe lvl 20 to fish and ride chocobos.)
But you could try asking a GM to check your account for any rollbacks/abnormalities during your absense. Those should be logged.

[Necrosis]

My alt used to be my main, however I switched to a new character, hence an alt with extra jobs. My main character not have *any* extra jobs anymore, none, not even at level 1, they are simply gone. And I know I unlocked them all, except for Dancer and Scholar. I leveled them all somewhat as well, spent a lot of time on my Summoner. Also spent time getting all the spells that the job could use at X level, except for the Avatars on my Summoner (had all the spirits though). My account hasn't been logged into since December 2008, when I last logged in, so I doubt this is the doing of someone and rather a screw up on Square Enix's side. I simply can't imagine how all of my extra jobs could disappear. I went to my Mog House just to make sure it wasn't a bug of them simply not showing up on my list, the only jobs I still have at all are the 6 basic ones. I submitted a ticket, so I'm hoping Square Enix can restore all my lost jobs and skills.