Data reap off

Today I actives 10GB data on my phone . I realize within 12 hours I have lost 6.42GB , and on top of that I switch off and on data and most I am running Whatsapp app , and when you call vodacom they come with excuse of I use iPhone and which is lemme excuse I have been using iPhone for last 6 years the rate which it chowed the data I am shocked and funny part is Monday I bought 1GB it lasted me for four days . I feel like vodacom robs me and come with a lemme excuse of iPhone when I have seen that it’s not fair to loose data like that it’s like they always rob customers and say iPhone story . Today I feel ****** by vodacom which at this point I am disappointed on their reasons cos when we go thru their reason everything is off but it still chows