Thank you for your clarification.
Note: Where dues of the secured creditor are not fully satisfied with the sale proceeds of the secured assets, the secured creditor may file an application to the Debts Recovery Tribunal having jurisdiction or a competent court, as the case may be, for recovery of the balance amount from the borrower.
However please note that attachment/auction shall not effect the rights, subsisting prior to the attachment of the property, of person not parties to the proceedings in connecttion with which the attachment is made. It is a settled position of law as laid down my SC in case of Vannarakkal Kallalathil Sreedharan v. Chandramaath Balakrishnan (1990) 3 SCC 291, that. "the agreement for sale indeed creates a obligation attached to the owenership of the property and since the attaching creditor is entitled to attach only, the right title and intrest of the judgement debtor, the attachment cannot free from the obligation incurred under the contract for sale. Sec. 64 of the CPC no doubt was intented to protect the attaching creditor, but if the subsequest conveyance is in pursuance of an agreement for sale which was before the attachment, the contractual obligation arising thereform must be allowed to prevail o ver the right of the attaching creditor. the rights of the crediotr shall not be allowed to override the contractual obligation arising from an antecedent for sale of teh attached property".
So the purchaser can file an application before the tribunal/court to recall the auction notice and /or file a writ before the High court for quashing the auction notice.