VODACOM Service Thumps Down

I have been getting notifications for a cell phone number that does not belong to me. ********** 046 for over a year. I have reported it to Vodacom. They say that they cannot do anything for me. I went to the local branch. I was told to call the customer care line. They gave me a reference number and said I must wait.Aftet two days I was told sorry they can't do anything for me. This person constantly uses data like 10mb and I get notifications some times over 10 to 20 messages a day. When I try contacting this person twhy don't answer the phone. VODACOM doesn't seem to care that these notifications are a constant nuinance to me.