they never leave a message.

Claim to be claims information want bank card number

The woman left a message two days in a row (a recording) but I couldn't understand what she said at all so I don't know the nature of the call but after replaying it about 6 times, I caught the number. I did not call back.

This number has called many times but never left a message as she did this time.  The woman's voice was extremely hard to understand, and the first part of the message was cut off.  A phone number was left to call back, but there is/was no way that I will/would have call/called back.  Normally, I just erase such messages and/or ignore these type of phone calls.

They just called my Skype number which I have never given out -- so, it is definitely a random dialing scam. I'm getting a dozen calls a day now -- blocking all the numbers I can.