I get these calls every week.  Never leaves a message.

I always get two calls, back to back, from similar numbers. So far I've got 706-805-1038, 706-805-1191, 706-805-1342, 706-805-1369, 706-805-1229, 706-805-1101, 706-805-1408- 706-805-1051, 706-805-1385, 706-805-1158, 706-805-1159, 706-805-1419. They never leave a message and I haven't called them back.