Vodacom false advertising

Vodacom does false advertising. You will see an offer saying for example 500mb 1day and another offer 500 for today.. then you decide to buy the offer for one day presumably thinking 1day is 24 hours from the time of purchase. The part of today is clear you understand it will expire 1 minute to midnight.. but I don't understand why their 1 day offer also expires midnight instead of 24hours from time of purchase. Hai we being ****med here. I love the network IV been using Vodacom from day one I received a phone.