Hi Sathyajit, thank you for letting us know. I've searched for your emails or messages but we do not find any, that could be the reason why you have not received any response since we do not receive any emails from your end. Our system works perfectly fine, for some reason, you need to enter a valid card or inputting the right details and it will go through. For any concerns you may have, you could reach our support team and we will take care of you.
Regards,
Alvin