Night time data deducted from Normal data equates to theft.

In April I try to use night time data. I switched off my router to ensure that I go over to night time. After a 24 gig update for xbox, the data was deducted from my normal data. I phoned the call centre several times and logged complaints at the Bloemfontein service centre. The mistake was never rectified. Last night it happen again. All my data is not depleted after I did upgrades in my IMax and Iphones. There is no way I am going to try customer complaints or service centre again. This make of MTN a ******** minded company who do not rectify when they wonderfully deduct expensive data. I do not know if there is a way to get back at the bully attitude of MTN, but I have to wait out my contract and then cancel it. Your support against MTN "*****ing" our data will be highly regarded.