Price Increase 24 Month Contracts?!?!

I have 3 Contracts with Vodacom and just received a general notification of a price increase on all of these contracts. <br> <br> 2 of these contracts were obtained on a special from Vodacom and thus have reduced subscriptions. This was not considered when they decided to increase prices during a current contractual period. I think Vodacom will be losing quite a few customers due to this. <br> <br> I called their call centre to discussed I was placed on hold and then returned to the back of the que. This increase is totally unacceptable and if I was enticed into a 24 month contract due to a special at the time then I believe the special should be honoured for the 24 month period.