Fragery and chetting case

1) Land YY sale by Person ABC and land owner also involved .Police verified and confirmed Person ABC not cheating and informed me to pay money. person ABC and land owner both take money form me. 2) When collector informed based on Mutation Entry to me take NOC to transfer land from Person ABC . 3) Person ABC asked more money for giving NOC. 4)based on collector letter I got Registration office .registration number 2047 year 1998 . 5) When I had visited Registration office registration number 2047 year 1998 is different person name and different property and checked record till 1989 to 1999 his name not found in registration office. 6) With unregistered document I had found that Person ABC made with the help of SDO Mutation Entry having registration number 2047 of Year 1998 .Person ABC had transferred one land XX on his name( 7/12 ) and other land he tried for transfer but not transferred land YY (Government Right to transfer ) due to permission required from collector office & commissioner office.. 7) Now Police say it is not duty to check because land related issue is handled by tahasiladar office /Collector office even given information in written. 9) Forgery I am not able to make against Person ABC as SDO has to make Mutation Entry. collector /tahasiladar not taken any action as their department made fault also Asking NOC is fault because registration rule 44(I) will not allowed to do registration without permission .Details are given to collector in written with proof .? 10) In case of cheating the amount take by him is signed by Land owner also it look decided amount I paid there is no proof for asking additional amount and not given NOC.(asked on phone and personally).? 11) I want to know what charges to whom? ,cognizable offences ?and where to approach before filling complaint court?..,If Person ABC having any affidavit with land owner considered legal?