Anyone who uses Airtel axis credit card for gas booking? I have tried multiple times to book cylinder using the Airtel Thanks app and the booking never goes through. I have Bharat gas and whenever I try to book a new cylinder it always shows me an error - 'Invalid phone number. Try again later.' I have tried booking with the customer Id as well and that too fails. I am looking to get the 10% cashback on the card for gas cylinder booking but haven't been able to use it for last 3 months. Anyone facing this error?