Disappearing Data

This year February I took a 160gb data contract with Telkom. Which means I'll receive 80gb day and 80gb night. Everything was going well, really enjoying my data up until September when my 80gb day data depleted during the month which did not make sense because I was only using the data to browse the internet and nothing else. However I decided to let it slide and topup with 7gd data which lasted 2 days. October the 1st I received my 160gb data but depleted again during the month. That bothered me so I had to delete apps running in the background and set up notifications in all my devices, making sure that my devices are off when I'm not using data and have a password on my router. I decided to topup 7gb but as usual it depleted in 2 days. 1st November 160gb came through and I have been monitoring my data usage but to my surprise from the 1st November to the 6th 16gb is gone. How is so? What is funny is that at 5am to 7am everyday I watch YouTube or showmax but my 80gb night data never depletes. What is going on with my day data. I called Telkom to check for me if the are any numbers connected to my router or if I'm sharing data with someone but Phumelela Ndlovu told me that there's nothing they can do. Telkom is failing it's paying and loyal customers. If it's possible to cancel I would cancel and move to another network. Telkom needs to tell us how to monitor our routers or if they can add something we can use to block unknown numbers in their telkom app. Cause this is ridiculous. If I don't get help regarding ASAP I will escalate this and definitely cancel.