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Try to clear data for update centre and restart your device.
Strange though, are you sure you have updated? Update centre is gone in lollipop.
As alexdon said, make sure that you've updated to lollipop.
Up. Still no solution?
And I can´t delete the data of this file called "update service"
Ok so you updated the samll update ?
Any change in build number ?
Go to settings > about phone > software update > options key > refresh
Is there any update that the phone shows now ? or it's gone now ?
If it shows now, then go to settings > apps > all > Software update > clear data.
Let us know how it goes. 