If your host gave you a link to your own servers MRTG's then it is your responsibility to watch your own bandwidth, and if you see something looking strange, then you should have the host take a look at it. You really cannot expect the host to be a babysitter for every server they host. But if you talked to them prior to this isolated incident, and they messed up then they should not charge you. But in summary it really is your own responsibility to be watching your own bandwidth bro.
