No code listing.
I tried both cordova-plugin-admobpro and cordova-plugin-admob-simple.
Both can show test ads, but after removing isTesting=true attribute I get "Error 0 - Internal Error" in response.

I also tried using the working code that I used half year ago - same result!

I checked different app on my AdMob account - it shows ads, so account is not blocked. BUT my app was blocked once and then un-blocked by Google.

I use the latest Cordova version at this moment (5.1.1).

Does anyone have any thoughts?