As long as you remain insured with BeRebel, if you don't use the vehicle, you only pay the monthly minimum at the beginning of each month.
Until the Commercial Offer expires, all the unused km included are carried forward: for example, if you keep the vehicle stationary for 3 months and then decide to use it, in the following month the unused 600 km add up to the 200 km included. In the final balance of that month you would only pay for the km traveled over 800 km!