If the bank has issued an 8(1) notice correctly mentioning the SA case number but the 9(1) paper publication shows an incorrect SA case number, this by itself is not likely to invalidate the auction, provided the essential particulars such as the property description, borrower’s identity, and other statutory details are correctly stated. Courts generally view minor clerical or typographical errors in sale notices as curable defects when they do not cause any real prejudice to the borrower or third parties. Since in your case the borrower has admittedly received the 8(6) notice with the correct case number, they have been duly informed of the proceedings, and their right to redeem or object ordinarily ends after the expiry of the timelines under Section 13(4) of the SARFAESI Act and Rule 9(1) of the Security Interest (Enforcement) Rules.
The borrower may still attempt to challenge the sale citing procedural irregularities, including the wrong case number in the 9(1) publication. However, case law shows that unless they can demonstrate loss of opportunity, fraud, or substantive prejudice, courts are reluctant to set aside a concluded auction merely on such minor grounds, especially where other notices were correctly issued and served. Recent rulings by the Supreme Court and several High Courts have confirmed that confirmed SARFAESI sales will not be undone for trivial procedural defects if statutory requirements have been substantially complied with.
On the facts described, it appears safe to participate in the auction if the bank confirms that all key notices, timelines, and procedures have been duly followed apart from the incorrect case number in the paper advertisement. To safeguard your position, you may ask the bank for a written clarification that the error is typographical and does not affect the validity of the sale, and check that no stay order or adverse direction has been issued by any court or DRT.
In short, a wrong SA number in the 9(1) paper publication, with correct details in the 8(1) and 8(6) notices served on the borrower, is unlikely by itself to lead to the auction being cancelled, and you can proceed with bidding while keeping records of the bank’s confirmation for future reference.