Data bundles not working as advertised.

I bought the 50GB day and 50GB nite bundle. This morning I got up early, 5 am to do downloads that would take a fair amount of data. I received a message at 05:02 that I have 42GB available. About 30 minutes later I was down to about 33GB on the day bundle and about 2GB on the Nite bundle. All of it should have been off the nite bundle. I have seen others struggle with the same issue. I don't even try to contact Cell C anymore. The last time I emailed I was told I would be contacted in 48 hours. A week later I am still waiting.