Unable to upgrade my iCloud storage (Tunisian Store)

Hi,

I have my Apple Store country set to Tunisia (the country where I actually reside). And I have a credit card issued by a Tunisian card registered on that store (which I used previously to make purchases on the App Store). The card, as mentioned, is Tunisian and is approved for use in foreign currency (Euros and USD). I used it this same day in other stores and it's working.

I keep receiving the following message when trying to upgrade my iCloud storage: "The credit card you entered is not supported in the Tunisian store."

Any idea how this can be fixed?

Thanks,

Omar