My Data being depleted

On February 26 I had 14MB of data on my phone. I then loaded 25MB which meant I had a total of 39MB. To my surprise the data was depleted within 10 minutes of loading. I only use my data for Whatsapp and connecting to the internet. I don't do any downloading of music or anything to that effect. <br> I then called the call centre to complain and was given a reference and told it would be sorted out within 72 hours. Because I needed to stay connected, I then decided to load 25MB of data on 27 March. This data depleted by the 29th and I then called in again and the complaint was put under the same reference number. On Friday 4 March I then called in again because 72hrs had lapsed and still nothing had been done. To my horror, I was told that my query had still not been attended to. <br> <br> I then proceeded to load more data, this time I loaded 250MB on 5 March. To my horror on the 6 March 10MB had been used up, this is very unusual for data to just disappear like that. <br> <br> I'm extremely frustrated and now feel that I'm taking the matter to a public platform. Hopefully something will be done and my data will be reimbursed. I wish this matter to be sorted out as a matter of urgency. I'M FRUSTRATED