No change of contract info by vodacom

Hi there <br> <br> I have been a Vodacom customers for years now and very two years I do upgrade and extend my contract but Vodacom recently just downgrading my contract failing to letting me know that the off peak 120 does not excist any more and that I will loose all my free minutes. Yesterday they just trandfer me from one department to another and both times I hold on more than 15 minutes no one picking up. I want to able to ajust my contract according to my needs. please help asp.<br> <br> Regards Benica