HDFC Bank — cashback not received

Its been more than 130days, and i havent received cashback of 6k.
Now please me know if your bank is going to pay late fee fine?
Bcoz whenever customer is not able to pay the bill on time, you fine them.
Please let me knw whats your action.
I can't wait longer. I want solution. I had wrote couple of mails but no response (Hbl=[protected].
In my bill it was clearly mentioned that "cashback will be credited within 120days". And today is 134 day.