I am suffering with a similar problem.
(my father gifted me two houses after he was sure that his life came to an end. after few months when he recovered , with the influence of his illegal partner had revoked the gift deed and was expired after 6 moths. I had filed a writ from high court and a status quo was ordered. but the wicked lady claiming herself as wife had executed a sale deed and the system still sleeps)
As long as there is no mechanism to punish the sub-registrar for the wrong doings these stupids would be handling registrations at will.
A simple answer given by legal experts is to file a civil suit!!!
For they are sure that it takes a minimum of 10-15 for courts to look into these issues.
I had written to the President, Prime Minister, Principal Secretary(rev), IG - Stamps & registrations...
But there would be no response or again a simple reply that file a civil suit.
THUS IS THE EMERGING INDUSTRY OF ANTI-SOCIAL ELEMENTS AND PAY THE RIGHTFUL 1/10TH AMOUNT. AND STILL THE ADMINISTRATION INCLUDING THE JURY KEEPS MUM AND BLIND FOLDED.
There should be an end to this system. and this is possible only when people oppose the system and fight back for a change with loud voice.