How to build credibility and overcome objections when coldcalling

[Samuel Hall]

Hey folks, 

I have started a website (Carrot), have ordered bandit signs, door hangers and am cold calling lists while I am waiting on my marketing materials to arrive. I am tracking my conversion numbers, recording my cold calling sessions so that I can review them and share them with others for feedback. I want to track my objections so that I can develop effective objection-handlers. 

Two objections I have come across recently that I don't know how to handle:

A guy was speaking to me, until he found out that I used Google Voice for my phone number. He accused me of being a "Swindler" and asked me to not contact him again. 

I have since changed my voicemail from the standard google voice greeting, to a custom one. I mentioned my website on the voicemail. 

Another guy called me back after I left a generic voicemail on his cell (cold lead). I didn't pick up immediately, he heard my voicemail and I called him back within 5 minutes. After hearing my voicemail he sounded completely turned off to having a conversation. 

What are the best practices when cold calling? What is the balance between professionalism and presenting oneself as a genuine person? 

My current voicemail is as follows:
"Hey you've reached Sam and webuyhousesgj dot com, I'll call you back as soon as i'm able. In the meanwhile please leave your name, number and the property you plan on selling. If you'd like to find out more about what we are and what we do  visit our website at webuyhousesgj dot com"

Any feedback or insight is appreciated.