Data disappearing

A few months ago my 2 GB data contract started running out for some reason. I went to bodacom outside Somerset West Mall. I was told i had to go back with my laptop. Said its updates taking data. They disabled this. It still continued. Went back to them and they couldnt tell me what the problem was . In Sept i started a 2nd data contract-5GB No problems during Sept. Halfway through Oct data ran out. I still have another 2GB data contract so plugged that one in the router. I had not used this since end of Aug within less than 2 hours the 2GB was gone. All i was using was a online reference programme.

I went to vodacom (somerset west main rd) on 16/10. They checked laptopl and again disabled updates. I bought 500mb data. After less than 30mins the data was gone. I went back to the same vodacom on 17/10 they told me that the updates hadnt been disabled properly the previous day!! I again bought data. The problem was still not solved and i eventually asled my brother (IT specialist) to look at my laptop and he sisabled the server. I bought more data. I that week i spent nearly R400 on data. On Sunday 22/10 I had 350mb. That evening all i did was send 4 emails.

Ob Monday 23/10 i recieved emails and after sending 1 email all my data was finished. This is impossible.

I only have 2 devices connected to the wifi. Laptop and cellphone.

I am not downloading videos etc. I mainly use only online referencing programme for my studies and gmail.

This is unacceptable. I have been back and forth to vidacom and they have not been able to solve the problem. What is happening to my data?!