airtime disappearing

This morning i recharged my Phone with R20.00 airtime worst part my prepaid number doesn't use data and I am not subscribed to any services so why keep taking my airtime? i made only 4 calls which where less than 2min and 1 of those calls to Cell C did not go through even to voice mail, I tried calling 1 of your agents, RUDE as always and she said I'm trying to be sarcastic,when i asked her why was money disappearing from my account.<br> Whatever happened to being the service provider that supplies transparency and fare billing to your clients? May someone please investigate and contact me due to this has been happening since March.