Cell C lies

Cell C lies to its customers! On both the Cell C app and Cell C internet web site, I am told I have data available to me. But, can not use data as it is depleted. No matter how I ask for clarification on this, the Customer Care people tell me that I only have night time data and this is still data available to me. Not indicated as such, anywhere! Why lie to your customers? Why not distinguish between day time and night time data? Why can I not buy day time data only? This is not fair to me as a customer. This practice in disingenuous to the customer.