Telkom data *******

I bought 3GB data on Monice at 20:32 on 30 May 2019 for R28.50. The data was supposed to last for 2 days as per USSD at time of purchase. However, the data expired at 01 June 2019 at 00:00 which is about 18 hours short of 2 days. How does Telkom count their hours? Or in line with their ******* tendencies, the Telkom hour is only a fraction of the normal hour. 2 days = 48hours not 28 hours. ****************. Rather be honest about it even though its a promotion.