Airtime mysteriously vanishes

I have had issues regarding a spare top up contract I have and your consultants are *********** of helping me with the issue. I don't understand why I need to keep on repeating myself and thus will now revert to other platforms. My airtime gets deducted inexplicably by only 1c every couple of hours - my phone can be switched on or off, my phone is constantly connected to Wifi when it is switched on and I never activate mobile data but these 1c's constantly get deducted off my bill. How on earth is this possible? In May I asked the consultant why this is happening and this person did not give me an answer, instead, I was awarded with a data bundle. Honestly, this seems more like a tactic to get away with deducting the 1c to just keep a client's mouth shut. How many customers do this happen with and why is this happening. I will yet again state that MY DADA IS SWITCHED OFF so please don't use this as an excuse - I'm really not stupid.