Clay telecom will take your credit card details and charge you on the same over and over again for bill that doesn’t belong to you. I was travelling to HongKong and used a Clay sim card for the same. Like any customer, i gave my details to save me the hassle of running to make payments once the bill is generated. Having cleared my bill, they charged my card again for a bill against a UK number, while i was still in India !!!! And they don’t even close the records. Sick!