Sir, firstly it appears that the RWA is wrong for not issuing the NOC. You are correct that the RWA can't refuse to provide the NOC for no reason. There are bye laws of RWA which the RWA has to adhere to and can't violate the same. As far as written legal opinion is concerned you have to approach the advocate of your choosing on this platform based upon the answers you receive. The fees depends upon advocate to Advocate. Choose wisely.
Good luck!