Who called from 8034090350

I called the number back from a business phone and received the following message "You have successfully completed a test call with SW telecom"........

I keep missing a call from this number and when I try calling the number back it is busy.

Called the number back and it just gives you the busy signal

Its Scana i just paid my bill on line. Got a call from that number/

Please don't call my phone again