Q: payment method was declined

We are fellow users here on these user-to-user forums, you're not talking to iTunes Support nor Apple.

What type of visa card is it, credit or debit ? If it's a debit card then I don't think that they are still accepted as a valid payment method in all countries - from this page :

You may be able to use other payment types in your country, like debit and Maestro cards.

which implies that they are not accepted in all countries, and there have been a number of posts about them being declined.

For a card to have a chance of being accepted it needs to be registered to exactly the same name and address (including format and spacing etc) that you have on your iTunes account, and have been issued by a bank in the country where you and your iTunes account are. If it is then you could check with the card issuer to see if it's them that are declining it, and if not then try contacting iTunes Support (these are user-to-user forums) and see if they know why it's being declined (but you might not be able to use a debit card) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Account Management