Data is being ******!!!

I have been with Vodacom for over 10 years and have always been happy but lately I don't know what has been going on. I have had to buy 3GB this month already where I normally only buy 1GB and still have data left over at the end of the month. My automatic updates are switched off and I am connected to Wifi 70% of the time. I have an internet contract as well and the same thing has happened this month. I have never had to recharge my internet contract and half way through this month I needed to recharge. If you inquire about it you are just told that you used the data. How can I go to sleep at night with 800Mb and wake up with no data when the Wifi router is on all night?!? This is **************** and I am not the only one experiencing this problem by the looks of the complaints on Hello Peter. Three people in my family are experiencing the same problem! It's a clever way to \*****"people's money as there is no way to track it. What is going on Voadcom???"""