Unable to complete payment on my iTunes account

Use the link you were provided with or click on the link below. Choose Apple Account or scroll to the bottom of the page to chat or call Apple Support in your country or region. 

Contact Apple Support - Apple Support

I did help you out. I gave you a link to contact Apple Support.

Everyone participating here is just a fellow Apple users. No one participating is an Apple employee. You must follow the linked I shared above.