Dissappearance of data and pathetic service

I called into the customer service to enquire about my data disappearing. I asked the consultant what is the reason for me having data at night when my mobile data was switched of and my phone had been switched of as well, her response is that it was due to me surfing the net @ 7:02, when I disputed that she went on to say its due to background applications, this however cannot have happened as my mobile data was off. I am fed up now as this is not the 1st data has disappeared into thin air. Telkom needs to take ownership and sort out their mishaps. I was appalled to find out there was no manager or team leader on the floor fort ,e to speak to as the consultant had no idea what she was doing. this is ridiculous as we spend a lot of money on data and airtime only to be ********ted.