I think the lesson here is, if you paid black money while buying your property keep it to your self don't broad cast it on the internet

Robo, you are the voice of reason. You have figured it out. 

No need, Robo has closed it. 

The black money we have paid out was for a building plot not for a house.  So having built a house the property is obviously much more valuable than the amount we paid.  The amount of cash we handed over is a tiny percentage of the current value of the property and if we were ever to sell it I really don't think it would make much difference to any Capital Gain.

If the notary isn't in any way respponsible for what goes on in his office then I don't see how I could be.  I paid over some cash to someone in payment for a piece of land.  It isn't up to me to determine what they do with the money once they've got it