It was only November that Sky introduced the monitor so this is why you've just been upgraded. You will be on the Everyday service now which gives you 10 GIG. Maybe your speeds will rise to as it allows upto 10MB and it's only a fiver a month if you have the calls package. See here -
www.sky.com/moreaboutusage
The best thing to do is upgrade to the Unlimited service if you have Sky Talk. It's free for 6 months then downgrade to Everyday if you wish to afterwards
http://www.sky.com/portal/site/skyco...ucts/broadband