Ridiculous data charges

I am extremely dissatisfied with the recent data charges. I constantly receive calls from your call centre informing me of my "high data usage" as they obviously see my (almost daily) top ups just to do very minimal stuff on my phone. I'm beginning to get the impression that you're just ripping me off. 100MB doesn't even last half a day and I'm not using my phone much, it's ridiculous!! Two days ago I received a call from one of your agents (immediately after my data got depleted, conveniently) that he wanted to offer me a 10G data contract or something for R199/pm. It appears that you intentionally overcharge your customers in order to lure then into a contract. I already have 2 with you and I'm beginning to regret every minute of it! Other service providers offer so much more for less!!!! The agent wanted me to accept immediately over the phone and have the package which include a router to be couriered to me. As I was overwhelmed by what just occurred (my data just vanishing within minutes) and did not have a definite delivery address at the time as I'm on the road a lot and he could not arrange for this package to be delivered to the nearest Vodacom outlet (still don't understand why!!!) I declined as the call was getting irritating when no alternative solution was given to me. I am now requesting that you get someone competent to call me and structure a better deal in order for our relationship to continue. Alternatively, I'll need to switch to a more flexible and cost-effective network provider. This service leaves much to be desired and I'm extremely disappointed at this point.