Airtime disappearing Cell C

I just recharged with R50 at 07:46 when I check my balance now is zero I phoned them to complain they say my phone background eats my data while I was not connected to any social networks. It was not the first time the other time R50 gone also I phoned when they checked my phone was subscribed to few games which I knew nothing about. Everytime I recharge they take all my airtime no compansation from Cell C yet they are the one taking all the airtime without using it. I think this is the last time they eat my airtime I will port to Telkom they understand their people and their needs big ups to Telkom.