Turkish Airlines Misleading Business Class Upgrade Only Covered One Flight Segment

I recently purchased a business class upgrade from Turkish Airlines for two passengers travelling from Taipei to Copenhagen via Istanbul. The upgrade was purchased on 12 November 2026 at around 11:13 pm. Before confirming the payment, the online offer very clearly laid out the entire itinerary, explicitly showing Taipei–Istanbul and Istanbul–Copenhagen and presenting the upgrade as covering this whole trip. The way the offer was displayed clearly stated that both segments from Taipei to Istanbul and from Istanbul to Copenhagen were included in the upgrade. At no point on the screen before payment was it stated or made obvious that the upgrade would apply only to the last, short Istanbul–Copenhagen segment. The scope of the upgrade is essential information, and it should be transparent before a customer proceeds with payment. Only after paying did the confirmation reveal that the upgrade applied solely to the Istanbul–Copenhagen flight, while the long overnight Taipei–Istanbul segment remained in economy class. When I checked the booking in your system, it showed that only the short connecting flight was in business class. This is entirely different from what a reasonable customer would understand from the way the offer was presented before payment, and I felt misled and scammed by this. After experiencing this issue, I identified several other customer complaints describing the exact same situation, where passengers believed they were upgrading their whole journey only to discover after payment that the upgrade covered only the shorter leg. This shows a clear and ongoing pattern of severely misleading passengers with upgrade offers. I have already submitted a formal complaint directly to Turkish Airlines about this issue. I request either a full refund for this misleading upgrade or, alternatively, to honor the business class upgrade for the entire Taipei–Copenhagen journey as the offer was presented.