Absolute worst service

Good day

I loaded 100MG of Data this morning at around 8:30 by 13:20 this afternoon I got a message from Vodacom that my data was depleted after I've only Whatsapp my 2 daughters. After receiving a reminder that my data was on 24 MG left I immediately closed Whatsapp that was open at that stage 2 minutes later I receive another sms to tell me that my data was depleted. Vodacom is *****ing our DATA. This is a totally money making **** and we as the consumer is the ones that is having the bad side of it all. This is not the first time that this has happened. I am very disapointed in Vodacom's service. They waste time by asking stupid questions but can't sort out the problem. After my last complaint to them it was better for a while but then then it started happening again. What should us as consumers do. I don't have money to throw around to buy data every day. Please help