*** called my number 8 times last night!!

I received a call from this number *** and did not pick it up since it was in the middle of the night and I don't know this number. I then redirected the number to voice mail.<br> <br> In the morning, I find that this number called my phone 8 times at that time of night! Only this morning I called the number, they just dropped it without answering it, I also used a private number to call this number a while ago, the person just answers the phone and keeps quiet until they drop the phone.<br> <br> Please, Vodacom, please investigate this number as this is scary.