Last night I made a call, and was informed that I had exceeded my FUP and hence 1cent per min, checking afterwards I have only made 25mins of calls this week, now I know the FUP used to be 300mins per rolling week, but I cant now find any reference to this. Does anyone know what it now is? Please

At the bottom of every page it has:

* Max 300 minutes per week of free calls, measured over the last 7 days and per unique IP address. Unused free minutes cannot be taken to the following week(s). If limit is exceeded the normal rates apply. With your FREE DAYS you can call for free to all the destinations listed as free! when you have no FREE DAYS left the normal rates apply. You can get extra Freedays by buying credit.

Maybe worth posing on their forum over at: http://forum.voipbuster.com

Reading a post on there it states:

The 7 days are starting every day. Meaning: always the last 7 days are counted!
Are you using direct call (callback)? This calls are counted as two calls, so in reality, in this case, you have only half of the free minutes!