wrong billing

i wanted to give zero rating unfortunately it does not allow me .i had a contract with Vodacom everything was going well until march they started to deduct R3000.00 and my contract was R340.00 when i phoned them they said I've made call and data knowing very well i did not make those calls following month they came again now it was was R5000.00 saying its airtime i used .i then requested that the block that sim card and give me detailed statement so that i can see who was contacted and so that i can trace the calls that were made on my contract its 2x months now they are telling me stories telling me they will handover the account ,when they supposed to send me that statement and its only fair for me to get the view of what happened to my account and open a case since i know very well i never used the starter pack and if they cant proof where does the bill come from then its wrong billing