Truecaller — Caller ID revealed

I had to call someone by hiding my caller ID for personal safety. But in spite of switching off my caller details the person found out my number through your application Trucaller. What's the point of hiding my number? When I check for certain private or No Caller ID numbers, Trucaller does a terrible job at revealing the details. How is it that they were able to retrieve my information?

I doubt if Trucaller can be trusted with our personal data.
I wish to file a complaint in the consumer court for the same.