How to stop/quit/delete iCloud?

I see many people have asked us but I don’t see any answers…

I never signed up for iCloud, and don’t want it, my work requires that any device I use be isolated from cloud services… I don’t want it, never asked for it, but it is stuck on both of my iPads and my phone now apparently….

I cannot find any way to delete or disconnect this annoyance.

even more irritating, I get constant iCloud solicitations to buy more of what I don’t want…

Of course Apple has no customer support so I’m here to ask..

Can anyone tell me how to delete/disconnect/kill the **** iCloud???

Two years ago all of my associates got rid of their book and power book units because of this type of bothersome abuse, and I am about ready to throw two new iPads in the garbage… Shopping for an android phone now…