incorrect billing

On the 4th of March Autopage send me my statement for March. When I opened it I phoned the branch emediatly and asked them I want a full out reportvon the sites and data that wasvused, they told me that I must phone head office for that, so I did and they send me the data ussage report but told me that ifI want the sites that I must open I case and the coard must give me a warrent then they can give me the sites. When I looked at the data usage I saw that there have been big downloads on my account and I saw on the 13th of February alone I used slmost 2G to download and I send them an email immediately and asked how that could be because on the 13th I was on my way to a wedding in Pongola and was on the road from 6:20 till about 14:00, and my router was pluged out and in my soutcase till now I have not received any feedback on that. Also I keep track of my ussage and according to my recordsI only used 2G and they are charging me for 6G. My router has a password on and it is not given to anyone. I would like to know where that downloads are boing done and by who because it is not us, we do not download stuff because we know of the liw data we have.