Worst service received from Vodacom

I have received the most horrible service from Vodacom. I upgraded for a certain amount and the invoice I received is much higher. I have been calling Vodacom for months now and nobody ever gets back to me. I just called now asking for a recording of the conversation with the upgrade consultant and was told that is not possible. I am now in talks with my lawyer which is an addition cost to me just to resolve this pricing issue. When did Vodacom service drop so bad.