declaring the action of the 4th Respondent in refusing to receive and register the document/Sale deed in respect of residential Flat No B1509 in 5th Floor belonging to the Petitioners in the Residential Apartment Complex viz THE NEST in BlockB BlockB1 in Sy No 195/Part 196/Part and 197/3 situated at Manikonda Jagir Village Rajendranagar Mandal Ranga Reddy District as illegal