Demand promisory note

I had raised housing loan from a co-operative and documents executed wherein the DP note was not mentioning rate of interest but it was not mentioned whether it is to be comopounded monthly,quarterly orhalf-yearly.No one of the item was ticked and bank, initially for two years compounded interest quarterly and after that Half yearly and now they are compounding monthly. what should be the correct legal approach. Can I insist for quarterly compounding of interest ? kindly guide me. -K.P.MEHTA