Last month we have use only ~2.5GB bandwidth... and to day we received excess bandwidth error??? Check the CPanel and it tell me we have use 27.7GB?!?!?! And today is only the eighth day of the month...

WOW... what should I do??? Contact the support???

Who is your host? interesting..

Maybe your site is infected by the code red worm or something lol :D

I dont' think so... last night I check the CPanel and it said 0.8GB I think... but wake up in the morning... and everything has changed!?!?!

WTF???

Check the stats, call support and let them know if they don't already. It's important to let your host know about this as soon as possible to avoid later problems.

Maybe you have any oh-me-so-h0rny pics on your server? :D

27gigs in one night...that's getting pretty hot under the collar. lol

Possible causes:
--- DOS (That'd be my first guess... But, your host would notice that)

--- The so eloquently put "oh-me-so-h0rny" items suck up bandwidth when discovered

--- Maybe you got popular :D...

Aside from that w/ 27 gigs in a night your host probably (obviously did if they sent you an invoice) noticed that traffic leaving their networks...

Check your logs when they refresh and ask your host to see if their servers are infected or if there was DOS attack...

Something happened, obviously :D...

get a webalizer log and look for the offending files :)

Probably a lot of:

suzie.jpg
bend069.jpg
4sum_lolitas.avi :D

I had the same thing happen to me with one of my clients...allegedly he went through 3.5 GB a day for a one-week period according to Webalizer. I ended up proving the host wrong (who shall remain anonymous, but I will say that it's not one I picked myself) by showing the page views and downloads put together (since there was nothing on this client's site to download, there was no mathematical way that this could have occurred.)

I guess what I'm trying to say is to take the stats and try to find a way to disprove them.