HDFC Bank — refund of premium

I am facing a similar issue. I submitted a policy request online and paid a premium of rs 300, 000 on 18th nov. Thereafter i submitted a cancelation request on 23rd nov for application number[protected]. I was informed that the return would be processed within 10 business days. It's been 55 days now and i haven't received the premium amount of rs 3 lakh. I have emailed hdfc multiple times and haven't received an adequate response. Last night i received a generic response that i needed to submit the neft form and cancelled cheque to process the refund. The fact is i had already done that when i submitted the cancellation request. Does hdfc life not train it's employees to look at the specifics of the case before responding to emails with a generic/standard response?
I am expecting hdfc life to compensate me for lost opportunity cost since the money is with them and i am losing out on interest/investment income. I am frustrated to the core following up on this and will be forced to lodge a legal complaint if not resolved in 2 days.
Thanks
Rupal thakkar