You're my worst regret

Last year September I took a contract with Vodacom for a 2 GB Wifi router. That has proved to be the very worst mistake I've ever made. The 2 GB doesn't even last 2 days, I've contacted the call centre in December when it got finished within a day, I was told to switch off certain apps, which I did, I actually uninstalled half of them but in January the 2 GB still finished within 2 days no matter how much I tried to save the data. So this month I closely monitored the data usage and I was shocked to realize that within 30 minutes of using the router with only Whatsapp and emails the data usage went from 2GB to 1.25 GB. After less than 10 mins it was already at 820 MB. This is a day light ******* Vodacom, to think that I still have over a year until this nonsense of a contract lapses gives me heart palpitations. What a HORRIBLE service!! What's funny is that when I buy 250 MB it lasts over a week or more but 2 GB that I get from you lasts a day. I will never take another contract with Vodacom, what ****** of a service provider you lot are! Pukes!!