Helps if you can deal directly with Nakheel and Tamweel rather than taking your problem to a Lawyer or
The Lands Department
Take both of them to task again and get an appointment to see some one with authority to make decisions,Insist until you do. May be you can reach a compromise? I agree it is frustrating trying to speak with some one who will not make a decision . Unfortunately it is a well know trait of Dubai!
The Dubai Department of Lands has been tasked with cleaning up the Real Estate Industry in whole. A huge monumental task. This would be my next port of call.