Telkom eat my day data during night express data time

When l use night express data at about 4h00am they eat my day data, they force us to buy night express data everytime we buy data knowing fully well that we are not going to use them,why Telkom tell me why do you always eat my day data at night.Now l am going to loose 8gb because l cannot use it even after waking up at 3h00am ***