My mobile number no longer exists and no one can help me

My cell number has been disconnected and no one can tell me why. I have called the call centre multiple times with no one giving me a valid reason why my mobile number no longer exists. I have also gone to the store and my Telkom profile has completely disappeared. This is really frustrating as I am on the job market and may be missing important calls. What makes me sadder is that I have been a loyal customer for over 10 years!!