Data disappeared in 2 days

I have a 2GB data contract with Vodacom. On Saturday 1st August my bundle failed to automatically renew and the Call centre noted a technical issue. As such I only managed to start using data on 02/08/2015.<br> <br> When logging into the internet on the morning of 04/08/2015 I received notice that I have depleted my data bundle. <br> <br> Previous months I had data left at the end of the period, and now I used the full 2GB in 2 days, without extensively using the internet? The contact center confirmed that all data was used, but were unable to supple me with further details. I then purchased a further data bundle and 30 minutes the data was gone again.<br> <br> I subsequently visited a Vodacom outlet to try and obtain details of the data used. They noted that I was at least the 10th person that day with the same issue. They also noted that it was no use to purchase top-up data as a previous client loaded data in store - and it immediately disappeared again.<br> <br> Yet the Call center maintain that there are no data issues and can't give me feedback on my data usage??