My brother had purchased a site from his friend. The site was allotted by BDA and the allottee had lease cum sale. The seller, has received the full consideration and has executed a registered general power of attorney in my favour. He has acknowledged the receipt of full consideration by way of an affidavit which is notarised. Also When my brother pur- chased the site, it was still in lease period, and BDA has not executed the absolute sale deed.
But, my friend has received a legal notice from the allottee stating that power of attorney is cancelled and he intends to sell the site to others. What is the remedy?