Vodacom and their Vodabucks

Vodacom services are full lies and deception. I was offered a deal of 500mg for 25rands + 45vodabucks so then I loaded 55 rand worth of airtime to purchase that deal and when I dial *133# they now have removed that offer and sent me a more expensive deal which I cannot afford. I really hate vodacom, they ***** from their customers and they deceive us. If they are not *****ing my airtime they drain my data like water going down the drain. I'm tired of this network