Service promised but not delivered

In June I phoned vodacom to change my contract type. I was an email with a quote. I then phoned back and accepted the quote and the transfer fee for my contract. I was told month end it would be debited and my contract changed over. I tried calling yesterday but the call centre was busy and no one answered. So I emailed customer care and got no reply. I am now still waiting to hear back from them as to why the contract change over was not done as agreed upon. Second time this year I've been let down by vodacom, it's as if they just don't want any clients.