Disappearing Data

A few months ago my Vodacom data started to disappear. My data used to be more than enough for a full month, but since it started to disappear it only lasts me a few days. I have no automatic downloads on and I even switched off my email accounts on this phone to save data. This is my work phone and I hardly ever use it for social media and internet browsing. Today is the sixth day of the month and I just received the following 5 messages in a row: 1) "You have less than 248MB left..." 2) "You have less than 98MB left..." 3) "You have less than 49MB left..." 4) "Your data has run out..." 5) "You've used R9 out-of-bundle data...". In this time (less than one minute) I haven't even received one WhatsApp message, no facebook, no Maps no background refreshing apps. I quickly switched off my data, like every month when it happens. I tried to speak to Vodacom, but it's absolutely useless. It sounds as if they get this call all the time - they are so well prepared. They have all these complex answers and you get passed on from one person to the next. After going through the verification process with each new assistant I was told that the system was offline and they will have to come back to me after a day or two. All their BS answers didn't work on me, but I just wonder how many elderly people are being bul**** and ****** in this manner.