Vodacom data a fluke

I bought a1GB of data @ R149 on Thursday via my vodacom app which gave me another 1GB free at the end of the day I had 2GB to use. By Friday night 2GB data was finished only by using fb,emails, updating my apps which are not many in number,used my autotrader app to look for a car and checked for a house via property 24 and instagram.I didn't even download any video nor login to you-tube surely I can't finish 2GB within 2days unless vodacom took me for a ride very sad because it's not the first time