Dear Member, To correct the mistakenly submitted NCP days in the EPFO Jan-24 challan, you need to follow these steps: 1. Write a letter to EPFO explaining the error in NCP days and requesting rectification. Include all relevant details such as the correct NCP days, the period in question, and any supporting documents. 2. Clearly state the nature of the error and provide a concise explanation to help expedite the correction process. 3. Send the letter to the appropriate EPFO office in Mathura, India, ensuring it reaches the designated department handling such corrections. 4. Follow up with EPFO to ensure they have received your letter and are processing the correction. Remember to maintain a record of all communication for future reference. By promptly addressing the error and providing accurate information, you can rectify the NCP days in the EPFO records effectively.