Hiya all!

Does anybody know of a program that monitors how much traffic did my internet service used since it's been on?
I'm kind of having a hard time searching on google, everything I find are programs that limit the traffic speed, but what I do want is something that limits the total download/upload traffic.

This is because I'm using a free mobile service that gives me a puny 100MB of free monthly download/upload traffic, but if I surprass that I have to pay a fee. In the store they advised me to have a program that gives me real time traffic and to calculate everything on a notebook. But surprisingly enough, they only know about Windows, and every search keyword I use direct me to traffic speed limit.

Thanks for the help in advance!