Vodacom *****ing R509-00 monthly instead of R134-00

hello my name is Angela goertz to this day vodacom has not contacted me at all. They took R509-00 out of my account on Friday the 13th OF November. I am a teacher so my hours that i work are from 8:00-3:00pm every day but at least they can send me a message to tell me what is going on but they wont i know i cannot always answer my phone but at least try and phone me or try and send me a message explaining why you are *****ing my money. But no they have done nothing to help me. Thank you Angela Goertz ***