Notice u/s.133(6)

sir. we are in receipt of the above notice with regard to short reporting of interest on income tax refund. now on reconciliation, we found that of 7,00,000 was under report of such income. so now while replying to the notice, can I pay the tax and reply or only reply will do based on which he will send the demad/ recombination, then I can pay the tax, kindly advice