I doubt there could be a central control system to control all AI in the world. That's because there won't be one single AI to rule them all but multiple ones and who knows how many of them could go rogue?
The ultimate solution would be a powerful enough EMP but that would render every tech object worthless and humanity would descend into darkness.
I agree with you Saurav.
We don't want all the tech to become worthless as it will send us back in time from where we won't be able to recover quickly and who knows whether we will be able to recover from there or not.