Horrible Vodacom service

Highly upset with Vodacom's service and after service. I received a call from Vodacom offering me a amended cover to my existing contract in the process of me accepting the call was disconnected. I called back and was transferred from pillar to post without assistance. I eventually got so fed up and asked one of the consultants to query this and get back to me as all their calls are suppose to be recorded. I never got any consultant to call be back. I once again called to follow up and still no joy, I asked to speak to a manager and she disconnected the call and never bothered to call back. This is terrible service.