[Resolved]  HDFC Bank — hdfc fastag - timeout error

On[protected], I made application for HDFC fast tag online. The payment was made by HDFC credit card and I received sms saying rs 500 is spent on ETOLL1291683. Immediately the session was closed with a timeout error. I have not received any reference number also.
I contacted HDFC customer service 3 times since then. Every time, I got the answer saying money is transferred and I will get sms from fast tag. I am not able to connect to fast tag help line - the number is always engaged.
The bank does not seem to be interested in solving customer issues created by the bank.