Vodafone postpaid connection

I hold a Vodafone postpaid connection and registered with DO NOT CALL Registry. I still get lot of promotional calls from ICICI, HDFC, CITIBANK, KOTAK MAHINDRA ETC FOR HOME LOANS , PERSONAL LOANS BUSINESS LOANS.POLICIES which are not of my insterest. i have receive these calls even if my out of country and have to pay heavily for my vodafone bills.Is our DNC Registry functional and if so how can I make a complaint?