Please review your standard operating procedures

I don't know and understand who is doing vodacom's standard operating procedures,their logic is questionable.each time you buy airtime they give you 1 hour nightshift minutes which is a good promotion idea however did you know that when you bought free minutes and try to use night shift,the night shift will not apply until you finished all your free minutes.so what is the use if you need to use up all your day minutes before you can use your night shift