HDFC Bank Bank Fastag — fastag issuance

Address:

560103

I applied for a FAs tag thru HDFC Bank on the 7th of August 2019. I made my payment thru my debit card. after payment I did not get any reference number so I called up their help line. I was told to wait for 15 days. after 15 days I contacted their representative to check on the same and she told me it takes time so to wait for one more weeks. After three weeks i call he up again and she tells me that without a reference number she cannot help me. I then contact my branch manager to help me out. apart from asking for many details ts now 26 th of september and they have not found a solution.
they confirm that my card has been debited for 500 ruppees for FAS tag, however i am surprised that till now they havenot been able to solve my issue nor refund my money back. I looked uptheir website to raise a complaint so I could then write to the banking ombudsman, but their web site does not have any drop down relating to FAS tag complaints. what is concerning is that i made the payment thru HDFC debit card itself and still they are unable to do anyting. I am very sure there are many customers like me who have lost their money but since the amoutn is just 500 they hesitate to take this up with higher authorities. request your help