How to resolve 'please contact iTunes' error when downloading apps from App Store?

To contact iTunes Support, do this: 

1. Click on this link --> Choose your country or region - Official Apple Support  

2. Select your country

3. Select: Billing & Subscriptions

4. Select: Subscriptions & Purchases

5. Select: Update payment method

6. Select a chat session or a phone call.

Copied from iTunes support - Apple Community

How do I contact iTunes

Hi, I want to download apps from App Store but there asking for (please contact with Itune to complete this transaction) even I didn’t buy anything and I put my number and details but still it’s showing same message can you help me to solve this issue it will be reall appreciated. Waiting for your earliest response on this

If my instructions on how to contact iTunes Support did not work for you, then please try contacting Apple Support directly.

Official Apple Support