Service tax detailed scruitny

we have recieved a notice for our partnership firm for year 2013-14 of detailed scruitny. in the notice they want our bank statement ,ITR, service tax return and copy of bills. we have gross receipt of 40000/- we were in basic exemption limt but we have paid service tax on this.now the problem is this that we paid rent of 166528/- for this period but we have claim only rs 96000/- in our profit and loss account in our ITR. now wat we have to do coz this is showing in our bank statement and if service tax authority will ask wat we have to answer????? kindly suggest plz as soon as possible... thanx in advance.....