Disappearing Airtime

I have been experiencing a problem with my airtime disappearing whenever I recharge my Cell C sim cards (3). I have logged a call with their call centre only to be told I need to switch off my data on my phone then load airtime and buy my WhatsApp bundles then switch on the data on my phone after loading R60 just to purchase a WhatsApp bundle. I’m totally frustrated cos I cannot load airtime every day and my airtime disappears in 2 Seconds. I have called the call centre again to find out where is my airtime going and I’m told I have subscribed to apps that I have never hear off and the call centre agent don’t know who these third parties are that is taking the airtime. They cannot help me all they can do is cancel this services … where is my airtime for the past few month on 3 of my Cell C numbers?