I have a few clients with troubles like you but they use Torrents, cracked software and go to bad web sites. There's not much I can do for them about prevention of the problem. Since I know them, I don't preach but nod a lot and reload the OS and in the case of phones have to once in a while re-flash the phone as the new nasties are quite invasive.
I think you need local support like my clients that can't deal with this.
I've got 10 computers all destroyed, data OS firmware or bios passwords, I can't use them. My blog has been half erased.I had to change printers 12 times in 3 years, and also the last one has been tampered. Mobiles? I've lost count of how many I've bought and returned because they don't work, the network is off or is redirected or filtered. On my sim card I've found more than 40 hidden contacts unknown to me. Facebook friends erased by the hundreds and the rest substituted with strangers. Photos, notes and chats erased too. All my emails erased, content modified, and today I've found out hidden contacts on gmail in groups all in sort of Arabic writing. Unix systems in my macair has 4020 files and folders, a technician told me it's been used as zombi or jumper. It was only 2 months old and I can't use it. Not to mention all the things that have disappeared from my home and the continuos acts of vandalism to my property. Nasty people in this world... Who can help?