How to add visa Saudi Arabia in my account

For Apple Pay? Not possible in Saudi Arabia.

Apple Pay participating banks and store cards

Hi

Follow the instructions here:

Change or remove your Apple ID payment information - Apple Support

Payment methods you can use in the iTunes Store, App Store, and iBooks Store - Apple Support

If you still need help, contact iTunes Support:

https://www.apple.com/support/itunes/contact/

(I'm afraid that no-one here can investigate your billing issue - this is a user-based community, not iTunes Support).