Internet Data Disappear

My company has a number of Telkom LTE and Mobile Data devices. We were on ADSL before and used on average 5GB of data per month. Since switching to LTE, our data started disappearing. We would use 10GB of data in two days, buy a 60GB data bundle and that will be gone in another 10 days. We have put metering on our computers and are not using the data. This is happening on multiple numbers. On Tuesday 20 Oct 2015 I switched my PC on, checked my Telkom LTE data which was on 9GB. In one day the bundle was fully depleted, although I only downloaded 1 GB of development software, and I had a single Skype Call.