Recently I tried to buy a game from India through MasterCard. My card is cleared for international purchases, yet GOG (on my desktop, laptop clients, as well as the main website) is unable to process my order. I tried multiple times to place the order and yet it doesn't work. It has thrown up the same error every single time. Any help would be much appreciated!

Contact support, I doubt any of us can help you. I do believe they put in more safeguards for certain transactions a while ago.