Why can't I pay for a Theme using my credit card?????

I’m serious - I’ve been trying for two days to purchase a Themeforest theme: Sleek. They will not accept credit card, paypal, anything…the problem cannot be related to accepting International Credit Cards either - because I can’t even get to the point where I enter information regarding my CC…so a bit ridiculous.

I am having the same issue. I’ve been trying for 2 days and i still can’t proceed with payment - even after trying a visa, visa debit and paypal option. - somebody please help.