I gave my credit card details and made the biggest mistake with clay SIM cards. Even after clearing my bill worth 5467/- rs with clay for my Singapore, they again charged my card for charges against some US number. A number that I didn't use, infact haven't traveled to US! Clay sims can't be trusted with customer information as sensitive as credit card details. It's taken me 25 days to explain their mistake to them. Totally unacceptable and never using them again.