Karvy computer share pvt. ltd
Money not refunded worth 72, 720

I have applied for the FPO of Power Grid Corp. of India for amount 99450 total 1105 shares. out of which i have got only 297 shares. rest amount (72720) is not refunded to me. On calling to customer care for 3 days i got to speak to them. They have asked me to send my address and bank account details to the Karvy computer share pvt ltd, vthalrao nagar office. i have send my details along with the application no.

Please let me know what further steps could be taken.my contact is 8017470455.