Overcharged on a Data Bundle

I've been a Vidacom customer for more than 20 years. I cancelled my contract on 1 September 2022 and migrated to prepaid. I bought 2GB of data on 24 September 2022, received confirmation of my purchase, which cost R149. I've just received my final account and been charged R259. After almost an hour of trying to speak to a human, the one I got tried to convince me that this is the amount I pay because of the contract I'm on (everytime I've bought data it cost R149 for 2GB). How desperate are Vodacom that they need to charge an additional R110, although given the reviews, I guess this is how they operate now. SO DISAPPOINTED BUT I GUESS NOT SUPRISED!