I have suddenly been advised by BT that I have used 11 gigabytes this last month and for the past 3 years have used 3 gigabytes. No other person uses my computer and although I have repeatly asked for BT to help find about the sudden high usage they have ignored me. Can someone help please.
many thanks to both of you. Yes TTG I do have a wireless router but it has been checked and is secure . I have now complained to Ofcom and they have promised to look into the matter.
First thing I would do is change your router wi-fi password then at least if it is the same next month it is something you are doing rather than somebody else (unless you tell someone your password)
On your PC you could have a look through the history of your browser and see if there is anything funny in there e.g. film sites, download sites etc...