Data ******* & frustrating call centre

After years of being on a data contract with Telkom and not having changed my browsing habits, GBs of data is now suddenly disappearing and Telkom wants me to prove it wasn't me using the data! I'm telling you it wasn't me as the times are not times when I'm using the internet - they can't even show me daytime vs nighttime usage even though that's what gets deducted!!!<br> How do you even calculate the usage if you can't differentiate this?!?!?! <br> <br> Can't want for Nov so I can cancel this contract.