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I don't think there's anything wrong as such, it's just part of a roll-out announced in mid-Feb to update to 4.3. Mine is still showing 4.1.2 also but recently received a minor update to enable 4G so I know my carrier's update system is active (Three).
Have a look at
Now rolling: Android 4.3; Jelly Bean for Xperia T, Xperia TX, Xperia V and Xperia SP | Sony Smartphones
Judging by some of the comments, we may rue the day we ever got updated!
AFAIK, the roll out depends on which carrier you are connected to as to how soon you get the latest update. I too have tried PCC and SUS but nothing so far.
Cheers mate at least I know it's not just this phone lol

Hi RobGee,Anyone had any ideas how to fix this as its still on 4.1.2
Hi RobGee,
As for me, I have added Sony to my list of companies never to buy from ever again. They are not getting another penny of my money!
JPC