If after buy SP+, say I activate 1gb per month from my SP+ counter, what will happens when:

1) I use more than 1gb in that month? Will my internet stop when it reached 1gb?

2) I use less than 1gb in the whole month? Will the balance credit back to my SP counter or gone/burnt upon the 30 day/1 month period cycle?

3) To activate the quota from my SP+ counter, is it we need to activate 1 time for auto activate / standing order or we need to manually activate every month? If standing order available how to do it?