Disappearing data

After I received a notification that my data was running low, I decided to purchase 100mb (x2) bundle. (Monday 28 August). By Tuesday, 5:29pm I received multiple sms's on my drive home: First, I had less than 99mb left, a few minutes later, less than 48 mb, then, I ran out of bundle. Thereafter, R12 out-of-bundle data, then R103 out-of-bundle, then R302 out of bundle. Every SMS with a "promotional" data offer, which expires within a ridiculous time frame, as if I am buying perishable goods?? This all happened on my drive home (+-40minutes), no apps open, and even my data manager app noted that since Monday, my data usage was not even close to the level of usage that these sms's indicated!! As a client of 16 years with Vodacom, I am seriously considering porting my number to another network, come January 2018 when my contract expires... also my wife's contract, which already expired, as well as my monthly data contract for my iPAD... Automated response is not going to cut it!! I want some personal intervention, my money and data back!!