Called twice and hung up

I have been get calls from 734 348-5071 to my cell phone every day for the past 4 days.....just hangs up when I answer & when I call this number back it either just rings, busy signal or hangs up. WTH...UGH.

This number has been showing up on my cell phone for the last week.  No one talks just hangs up when I answer.  I call back and it's busy.  I want it to stop does anyone know how to make it stop?

I've been having the same damn issue! Someone needs to find whoever this is and stop them, because it's annoying!

Have gotten 8 calls since Thurs. June 23.  Appears to be routing through India   First 4 calls wanted to sell me cheap educational financing.  They shifted gears for the other calls and said I had been entered on a list to win some sort of prize.  Asked to be taken off the list, and have now registered my cell phone on the national register.  This is the first time I've gotten repeated spam calls on my cell.   The area code is Ann Arbor, MI, but the calls are clearly coming from another continent....