https://skyairbus.com/blog/how....-to-request-a-call-b
When planning your journey with Singapore Airlines, you might have questions or need assistance with your flight bookings such as How do I request a callback at Singapore Airlines? you’re well-equipped to access this valuable customer service option. Dial at +1-800-971-7347(OTA) or + 0065-6407-5332 (USA) to get call back from Singapore Airlines.