Billing Error & then harassment

I have been harassed by automated calls to both my numbers due to vodacom making a mistake on my debit order?? Asking if I like being connected, but it's your mistake!! Be that as it may, I did phone Vodacom to sort out, and apparently accounts was closed, so I requested that they contact me to sort it out... 2 days later, and I'm still getting harassed by these automated phone calls...