Consumer Redressal

I would like to bring to your kind notice that I bought a Flat at 8, Haripada Dutta Lane, Kolkata-33 in the year 2009 and in that respect I received an NOC of Kolkata Municipal Corporation dated 12th October, 2009 from the previous landlord. But to my astonishment when few months back I decided to do mutation of my property and looking forward to get an NOC for the same, I found out that an humanguous amount of 62759/- has been levied upon me as per LOI dated 12th Feb 2014. In that LOI, years like 1998,1999,2000, 2002, 2005 are also showing pending even though I got the NOC on 12th Oct 2009. On this matter I have given request letters to the Assessor Collector twice dated 10th Feb2014 again on 2nd April 2014 but still I yet to get any help instead when again on 15th June 2014 I took LOI print out the amt increased to Rs66471/-.My Assesse No is 21-094-05-0692-0. I am not liable for any tax before KMC NOC dated 12th Oct 2009, however its been levied on me. Kindly help us.