fake thumb prints

My maternal uncles sold and transferred my mothers property through power of attorney of my mother using her fake thumb prints and signatures from 2001 and onwards . We were not aware of all this because they told my mother that all the property was transferred to them by their father(died on1989) in his life. But when we get aware and investigated into this issue we found that they sold some property through different inteqaals using fake thumbprints and signatures than in year 2001 they had created my mother’s power of attorney(mukhteyar nama aam) without my mothers permission and used it for transferring property. We had sent an application to the director anti corruption for open inquiry against this power of attorney. Incharge anti corruption of regional office recorded statement of my mother and all persons involved in it. But my Uncles who did all this fraud with us had given statement that now they have lost this mukhteyar nama aam.

[ 1.Gawah in mukhteyar nama aam have no relation with us and doesn’t belong to our family and one of them is from our village and other is from outside, in my opinion which doesn’t fulfill the requirements of mukhteyar nama aam.
2. Secondly they used this mukhteyar nama aam and gifted (hibah) property to their own names which I think is not legal in anyway.]

Question:
* If they lost it they can easily escape from forensic investigation of thumbprints and signatures!
* Is there any legal action can be taken in such condition?
* Can we file a fraud case against them in criminal court or it is a civil matter?

Please guide me what should we do.
God Bless You.