Help Me from Being Hack

can any kind soul help me on this? I have been living in hell for the past month.someone been remotely control my house network and devices for more than a month. I think it started with my son desktop then one day I notice werid pattern or movement on my ipad. I quickly try to log out my apple id and guess what? the guy on the cloud actually stop me from doing it by placing some kind of firewall on my screen which even I press on the log off button it takes no effect. eventually I lost all my email account and apple id and creditcard detail which I cancel it the minutes it happen.

so I decided to format my 1 desktip and 2 laptop after he cripple my 2 samsung phone and make use of find my ipad to lock my 2 ipad. the hell continue after I format my pc and laptop. he actually can control my pc or laptop even without plugging the lan cable or power cable for the laptop.

I am just and oldman know nothing about hacking and nobody to turn to. I am at lost now. me and my wife dun even dare to use mobile phone and on our smart tv.

please give me some advise on this issue. I have did what u can or what I know by reinstall new window with formatting the hard disc. for my phone I even flash rom the phone but its still infected.

may god bless you guys