I have also received similar calls on my device, LewisFamily. I know how concerning that can be. If the call came from your voicemail, that means the caller spoofed their identity to make it look like your own number was calling (your voicemail is your mobile number). With that being said, Caller ID Spoofing is not something that only happens to Verizon customers. This is an industry wide concern and all carriers are working towards solutions to minimize this inconvenience to our customers. My best recommendation is to not answer calls that show up as your voicemail, and also try using our Call Filter application to limit unwanted calls. I will include some helpful links below. Does this help clarify?
Click here: http://spr.ly/66011n5gv
Click here: http://spr.ly/66021n5ga