double registration

Dear Sir,

I had  bought a approved plot in 2007 April.

Let me give a brief background.

Mr.X (Real Estate guy) sold it to Mr & Mrs.Y. Y gave POA to Z. From Z i bought the land. After buying it i applied for EC (Encumberence Certificate). It was showing my name in EC and Applied one more EC for 13 yrs in 2008 Jan, which was also showing me as owner of that plot. When i applied for EC now, It was showing someones name(Mrs.A).

Mr.X sold it to Mrs.A. I just want to know if i file a case, Is there any advantage for me to get back my property.

Pls advise how should i approach this.....

Thanks