Why do customers switch?

Frankly speaking I have never faced any problem with the mobile carrier. There are never any delays or mistakes in the bills or billing cycles. The customer care people know what they are talking about and my problems, if any, are addressed quickly. I hope this remains this way.

But the good news stops at the mobile carrier itself. My best buddy's mobile carrier is the worst in this world. He has a post-paid account and every second time there is a mistake in his bill. It can be wrong calling minutes or long distance calls when he never makes any. And their customer care dept. is the dumbest of all services-providers. They wither don't know or don't care to explain and / or assure.

My ISP was another service provider which I was unhappy with. I had subscribed to a package with a data download cap of 500 MBs per month. And it always seem to get used up even on those month when I used to be out of the city on business. They din't have any mechanism to show me the daily breakup of my usage. I threatend to switch and ultimately did.

Although, I used to get calls from them claiming that their won't be any such issues in future, but I don't know if they really cared about me as a customer. And I believe there would be many customers like me who would have decided to
Churn.

I hope that there are no such other experiences that I might face in future. I hope that service-providers hire someone like Callminer if they are loosing customers and don't know why but really want to exist in the marketplace.