Disappearing Data Bundles

On the 16th of June 2018, roundabout 23h00-00h00. I purchased one of those daily data bundles of 150MB that last for 24HRs. At exactly 00H46 I receive a message saying I've got 85MB remaining, a minute later 00H47 I receive another SMS saying that my data has depleted. I wasn't downloading anything mind you. Called in to the customer service department and they told me they couldn't see the reason why the data had depleted. Wrote a complaint to ICASA to see if they could assist me. On Monday 17 June 2018, I get a response from a lady from Telkom who asked me what exactly what happened and then said she might have the wrong case. This morning, 20 June 2018 I get a call from her again and she tells me that they can't tell me the exact sites that visited but she can send me a spreadsheet that would show the activity of the transactions that week. Which she did, but still didn't explain what happened to that data neither does the spreadsheet.

Only positive thing I can take from filing a complaint with ICASA, is that my data bundles have lasted longer since I logged the complaint. Nice thing about the spreadsheet, it confirms that I received two SMSes at 00H46 and 00H47, and thank God for screenshots.