they called but didn't leave a messdage or talk when i answered

What's suspicious about it?  Does the 6 look like it's planning a crime with the 8?

Janet, no one calls a business with an attitude demanding information about the company.  We are telemarketers.  Do you realize how much time we would waste going through the name and address and phone number and supervisors name with every angry person just so they could say go screw yourself and I'm reporting you?  So before you make accusations put yourself in the shoes of a telemarketer.We offer a financial advisory service to people who WANT and NEED it.  We do not force our services down your throat, so if you are irate from the time you answer the call, it's easier to move on to someone a little more amiable who wants our service.  You could easily press two to be removed from the calling list.

They called at 2:31 pm today, and there was a woman's voice (recorded message) saying something about credit cards and interest rates.

Sounds like a scam.

why this number call , very suspicious number

Yes we all want to make money, save money etc. I'm look after my own finances because I'm a finacial advisor, so I don't need your help, really. So don't call again or I will take this to proper authorities for disciplinary action. Thank you.

I refuse to answer calls from unknown sources. They will not leave a message or identify themselves. Number in place of name.