Service tax on royalty

Dear Sir,

  You cannot escape from the cash payment of service tax along with interest. But can utilise the cenvat credit for different transaction by making revised S.T -3 return. For revision of return you will have 90 days time from the original return date.

Regards

Anand.

Its no question to submit revised st-3 return because recovery is from 2007. My question is i have paid service tax through cenvat credit whether its is cenvat or cash. So why i do pay interest on service tax, Yes i  am ready to pay service tax in cash but why interest.