Can I get a refund of my ULIP premium if I cancel my fund within the 15 day free look period?

My father has been duped by an Agent to buy an ULIP when all he wanted was a fixed deposit. He was made to invest in HDFC – Secure managed pension fund. Now the money will be stuck for 10 years. I have learnt that I can cancel the fund and get the money refund within 15 days of receipt of policy documents (15 day free look period). They say that they would refund the money within 15 days of cancelling the fund. Is it true? Can I go for this option? Would they harass me with the refund money?