iPhone 6S apps problem

Hello,

Few days ago I've upgraded my iPhone 5 to iPhone 6S. Everything was alright, except for few apps (whatsapp, skype, messenger, google translate, QR reader) that did not update, and everytime I tried to update those apps it kept saying that there is a problem.

I tried everything, I restarted my phone, I signed in and out from Apple ID. I even tried deleting the apps, which did not work and after that I couldn't even download those apps so I had to restore my iPhone... and now the iOS apps won't even download either.

Any help would be appreciated.

Maor