Lumpsome property tax deposit in 1980

Hello ours is the house in south Delhi. We got notice on 2017, 3rd Jan to pay property tax from 2004. But my family paid the lumpsome tax for 10 years in year 1988, so what is the solution for us ? Is the lumpsome tax that we paid still applicable to us ? https://www.thehindu.com/todays-paper/tp-national/tp-newdelhi/Property-tax-exemption-for-lump-sum-depositors/article16336585.ece