I too was receiving this number in relation to the google verification code.  I immediately noticed that the G- was not present in the box where you type in your verification code, I reluctantly typed in the code sent from this number and of course it did not work. So as a reminder if there is no G- at the beginning it is counterfeit.  I decided to call that number.  When answered, the message said that I had reach the number 970-275-5765 interesting.  I look that number up, and it belongs to Rebecca Sue Smith. Who knows if that number is legitimate, but the person executing this fraud has found a way to use it.  My very strong inclination is that someone has solicited this person to monitor you.  I do not believe it is a big scam situation.  To protect yourself make sure that your IP address is local and specific to you.  If you go to your Google Activity, it is accessed at the top right by your Initial icon, the six dots on the left, click on that and search for recent devices and where it shows you changed your password click on that and it will show you the IP address associated with that change, if it is anywhere other than your current city there is a problem. You need to install a secure connection which blocks intruders. I used Chaims.  Also if anyone else has your information meaning an ex or someone that can log on to your account from somewhere else (not from your soon to be secured ip address). Point is even if your network is secure, this criminal can go through another person. So get your network secured then change all passwords and even change your recovery email to something new that you have never used before, create one.  Also there is an option on some password changes to receive a phone call select that option. I would like to add that I did check my IP addresses, and I had many from other States therefore used Chaims to correct the situation.  Find a way to do an analysis of your system which can look for out of the ordinary IP addresses. If you ever get a number like this which is issuing a false code call it but first block your out going call (press *67 first) and you may gain more knowledge of the situation.