5 Gig of Data gone missing in one day

I upgraded to a package of 10Gig with a Wi-Fi rooter. I normally used around 6 Gig of data a month while I was on a Telkom device. I added a Wi-Fi rooter with 10 Gig of data to my existing cell phone package. I only started working fully on the 10th of January 2018 and started using the Vodacom Wi-Fi device again. By the 22nd January 2018 I discovered that there was no more data available and then lodged a complaint with reference number 1- ********** ********** . Vodacom then rep**** on the 23rd of January 2018 and mentioned via sms that they could not find any irregularities but credited my account with 5 Gig. I was not even at my office for the whole day and when I wanted to work this evening I discovered that I was without data again. After 4 calls to Vodacom, I received different advice and eventually with the 4th call was told by Kgomotso that I run out of data ones again. 5 Gig in one day PLUS another 5 Gig which I purchased to Top-up my data. They cannot tell me where the data went. Thus 20 Gig of data from the 10th of January till 23rd January and I did not download anything other than my normal work which previously I could do with a maximum of 6 Gig of data with my Telkom device.... Something is not right and nobody can assist me.