My iTunes keep declining my payment? Can anyone help me out on how to sort this please...thank you

What are you trying to use as your payment method, credit card, debit card ... ? If it's a debit card then not all seem to still be accepted, and might not be accepted at all in some countries.

For a card to have a chance of being accepted it needs to be registered to 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.

Or do you have a different card that you could try ? Or are iTunes gift cards available in your country to use as your payment method ?