There are several numbers, these people use. They say they are calling about a medical complaint you have. They say they are Medical Services. They are not legit.
Recent Complaint Activity for (512) 402-3739
An EveryCaller user suggested caller name as 512
07/25/17 12:00 PM
FTC Complaint reported as spam
04/07/17 12:00 AM
A Call Control user reported as spam
03/07/17 06:21 PM
A Call Control user suggested caller name as Medical services
03/07/17 10:52 AM
A Call Control user reported as spam
03/07/17 10:52 AM
You might be interested in checking reports for these numbers