Not able to use the night time data

On the 28th of December I purchased 5GB bundle of data which gives you an additional 5GB of night time data. While using the data between the hours of 00:00 and 07:00 am I noted that the day time data was depleting and not the night time data. I logged on to the Telkom App to chat to an agent who informed that I needed to switch my phone off and on in order to use the night time data (which was never an issue prior to this). That is what I did and I still can't use the data. This is really disappointing as now I am stuck with data that i cannot use at all. What type of company falsely advertises a product and does not deliver on that promise??? Kindly please advise what it is that I need to do as it seems as though my money has gone to waste!!!