The power of attorney obtained by you has no value. The sale by the original owner in 2015 will be held valid. Although you can file proceedings for recovery of money, if you have paid any consideration.
The sale by the original owner in 2015 is valid. Even if you had the power of attorney, the title to the property resided in the original owner and had all right to sell the property. If you have paid any consideration to the original owner you can file suit for recovery in the civil court.
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