Missed call from this number with no voicemail. I ...

Missed call from this number with no voicemail. I called them back, and a very rude lady said "ma'am there's no way to tell where the call came from it could have been a doctor or someone else." Umm... y'all called me? And left no voicemail? I was doing the polite thing by returning a missed call that could have been important. Awful customer service.