All payments for Supercity are carried out through Facebook payment system. Please contact Facebook Payment Support and your bank for information on why the payment was declined or auto refunded.
If you cannot use a credit card, but you would like to make a purchase for Supercity, you can select an alternative method of payment such as PayPal, mobile payment or Facebook gift card.
You can find out more information about payments for Facebook games, mobile payments and Facebook gift cards here.