Cant make a in-app purchase

As the screen shot shows, contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

If necessary, try Twitter

https://twitter.com/AppleSupport.   - 

Got the new iPad Air days ago. Tried to make in-app purchase for Club Vegas game but couldn’t get through. However, I was able to make the purchase the next day. Now the same problem reoccurred. Please assist ASAP. Thanks.