Why has my Apple account been disabled in the app store and itunes

Almost always, the issue is related to your payment method and only Apple will be able to resolve it.

If it says your App Store / iTunes is disabled, you’ll have to contact Apple Store Support directly; read this article: 

https://support.apple.com/en-us/HT208856

If the issue is regarding security, see this Apple article:

 https://support.apple.com/en-us/HT204106