LTE DATA DEPLETING WITHOUT IT BEING USED BY CUSTOMER

For the past 3 months my LTE data has been depleting without me even being at home during the day. I have all my automatic updates off and I even have data saver on my devices. Background data has also been restricted on my devices. There is no unauthorised access to my wifi. I called Telkom customer care service on 17 July 2019 and was given no joy since the consultant Mbali Zondo maintained that I am using my data. I get 40 gig day and 40 gig night data. I use my night data to download while I use my day data to simply send and receive messages from social media. This is ridicluous. I signed up for the contract last year sometime and did not have any problems with data depleting unnecessarily. It would have been explanatory if I was at home using my data. The data report shows that I am using my data. TELKOM PLEASE EXPLAIN!