I am writing to formally lodge a complaint regarding the recent upgrade offer for the Flying Blue - American Express Platinum Card, which included a 70,000 Miles bonus as a reward. I am concerned that this promotion may have been misleading.On or around September 10th, I applied for an upgrade to the Flying Blue - American Express Platinum Card. Subsequently, on September 12th, I received another promotional email from American Express, which stated that I had until September 17th to take advantage of the welcome bonus of 70,000 Miles for the upgrade. Given this information, I applied for the upgrade again on the same day, September 12th.After my card was upgraded and reflected in the Amex app, I contacted your customer service to inquire about how to claim the reward miles. To my surprise, I was informed that I did not qualify for the offer because the system registered my upgrade on September 17th, one day after the promotion had supposedly expired on September 16th.This situation is highly troubling. I submitted my upgrade request well before the stated deadline, yet your system recorded it after the offer’s expiration. This discrepancy raises serious concerns about the fairness and accuracy of the process. I respectfully request that you review the records to confirm that my application was submitted before the offer’s expiration date.I applied for the upgrade in good faith, trusting American Express and its promotional offer. It is deeply disappointing to now feel misled. I hope this issue can be resolved promptly and fairly.