Customer service at call center

I call the call center of an airline in Singapore. I was put on hold for more than 15 minutes. I gave up waiting - as I do not know how long more I have to wait.

When I was in Cambodia, I call the hotline of a mobile operator. The automated message said, "You are now the 6th caller on the queue. As this message gets repeated, the number keeps dropping. I was answered within a few minutes. We have to learn from Cambodia about the use of technology and customer service.