This is a collection agency they are very rude and don't say the name of their company

Vonage transcribed:  "Hello this is a message for Francis McGee. If you are not Francis McGee please hang up or disconnect. If you are Francis McGee please continue to listen to this message but do not listen to this message so that other people can hear it as it contains personal and private information. There will now be a three second pause in this message to allow you to listen to it in private. By remaining on the line you are acknowledging that you are Francis McGee this is national credit adjusters a debt collector calling you in regards to your national credit adjusters reference number 9806484. This is an attempt to collect a debt and any information obtained will be used for that purpose. Please call us back at eight."
... more. Please listen to your voicemail for the remainder of this message.

We have no idea who Francis McGee is.  

These [***] ALWAYS say they want to speak with 'VANESSA'.  I have no idea who that person is, and I have told them such, yet they've been calling my ph #, off an on, for MANY years.  It's apparent it is some kind of scam, probably the type where they tell the person they owe $$, when infact they do not.  Next time they call I will PRETEND to be this 'VANESSA' person to see what scam they try to perpetrate. They called from (562) 285-6071 which said 'LongBeach, CA' on CallerID.