V-Bucks purchase fails (Fortnite)

When creating an account in epic games, indicated the region of the Republic of Moldova !!! Now, when buying V-bucks in the epic game store, I indicate the VISA card issued by the Yumani service, but the transaction does not go through !!! I tried to change the region to Russia, but it is not possible to do this on my own, since the fields for changing the region in the account settings are blocked !!! When pressed, a message appears about the need to contact those. support when changing the region. I turned to those. support is denied to change the region. Help someone with advice on how you can change the region in your epic games account !!! Or how can you buy V-Bucks in your Moldovan region account ????