Who called from 9724274116

Called my cell phone 8 times while I had it turned off.  Robo-dialer from foreign county could not understand a word.  The number 972-427-4116 seems to be another fake or stolen number.

The calls are actually getting more frequent, even if I answer it clicks off at the sound of my voice, never leaves a message on my machine.  
Any suggestions from anyone?

Someone keeps calling but doesn't leave a message on what they want and obviously NOT important!!!

I've gotten multiple calls too. No voicemail. Weird...

I just called them back from a different number and they said they are an energy efficiency company