This number called me a month ago. The caller ID said "service". They didn't leave a voice mail.
At that time, this discussion thread pointed toward a spoofed Google call. The scariest post came from someone who answered the phone, and had to deal with a caller who wanted to know her bank information.
The same number called me again today. This time the caller ID said "Fedtaxreliefnow". Again, they didn't leave a voice mail.
Whatever they are selling, it has to be a scam. I think that the best thing to do is not to answer.
A search engine optimization telemarketer. They left the following message, "Limited clicks 24 hours a day at a flat rate on Google. Press the 1 key ..."