Increase data bundle price that was done deal for one price

I put the 3g red deal on my contact where I only pay R171. 20 per month. This month I go on my account details and saw I pay R222.07 for the same thing. They did not inform me at all about the price that increased. They say it is 50% discount but they lie because if you buy a normal 3 g of data it will cost you R229 per month. I called last week and Tuesday and so far no one has called me back regards the problem. The data also runs out so fast that the 3 g lasts me a week.