LIack of service received!!!!!!!!

All I would like is for Vodacom to contact me back. For 3 months I have been trying to sort out an upgrade contract issue. I have made countless phone calls, sent a number of emails (to every email address I can possibly find) and still it is not resolved. I keep on being told that it will be investigated and I will receive a call within 7 working days and it NEVER HAPPENS! You keep taking my money, but your service and agreements and compliance are not followed. Can a manager contact me, as I am not a money tree and am completely shocked at the lack of service received!!!!!!!!