Data and Airtime loss

Dear Cell C I am not one to complain or blast people or companies on social media but I feel like I have no choice in this instance. I have tried to contact the the Call center but I am not happy with the way they assisted me. Today I took the time to go to one of the Cell C outlets and I must say the gentleman tried to help me but told me after a long wait that he could not do anything to help me. I have had this contract for many years now but now off late I am not happy. My airtime go's missing, my free minutes go's missing, my data go's missing and all I am being told is that I am using it. My question is this: How am I using my data when it's switched off? How am I using my free minutes and airtime while I am asleep? And please don't tell me about it depleting because that airtime and free minutes and data was a day old. Don't even want to talk about the fact that I hardly ever have network because that is a whole other complaint on it's own. Like I said I don't do blasting on social networks but if the consultant is unable to assist me and doesn't know what to do how am I supposed to??