Vodacom call centre blocked my number

I am trying to cancel a pocket router supposed upgrade for my PC.I have been given the run around literally with all types of answers. Now the call centre has blocked my calls stating that a large number of calls have been made & therefore have blocked my number to prevent ********** calls. What nonsense. They have voice authentication and many other security questions when you phone.. How in heavens name can a problem be sorted out if they block you??????? Is it possible for someone from vodacom to contact me on *** ASAP PLEASE...........