in the event that you are eligible for a refund , and you pay a fee to utilize your account for a fixed period of time -lrb- `` fixed fees '' -rrb- , blizzard entertainment shall provide you with a `` pro rata '' refund in the same currency as the currency of payment equal to the fixed fees for the most recent billing period , less the daily charge for the service multiplied by the number of days that the service was available in that billing period .