Vodacom accounts

Attention Vodacom. I am trying to sort out a problem with my account. Every method of contact with your company ends up with a machine replying and it keeps telling me that I'm not the master account holder, which frankly is news to me since I've been the master account holder for 20 years now. How can I fix the problem if you won't let me speak to a person and keep rejecting my cell number?