how to transfer pilot on registered will basis

My father purchased a pilot from Meerut Development Authority, it is Registered. He make a Registered Will on my name. He is expired. I asked MDA to transfer pilot on my name, but they asked for mother's & 2 sister's NOC including some other formalities, I have 2 married sisters. My alive Mother & 2 Gawah are in favour. Both Sister's neither making objection & nor giving NOC. I went to civil court & file a case before 7 months. I want to know ; 1. weather my sister's NOC is must in this case? 2. Is it necessary to send Notice to sister's? 3. Is it must to have a duly signed official return acknowledgement / delivery receipt of notice? 4. What should i do now? 5. how to tackle my advocate? after 7 months i found myself on starting point. actually my advocate send 2 Notice to them but by registered post only, not through civil court/official daak.There is no proof that the Notice has been received by my sister's or not, except online printout of delivery receipt.