Unauthorized Charges added to my Bill Billing

I have a vodacom contract phne an a vodacom prepaid phne .For the past 4 mnths I have been billed R413 extra .from (R569 to R988) .Numerous calls to vodacom customer care since February have been made Lasting 45 mins to 1 hrin an attempt to resolve this .However to no avail. I have been promised this would be resolved 7 to 14 working days .end of mnth since February. To no avail Nobidy at Vodacom is prepared to Assist you In February I was informed by Ms Zimela Vodacom rewarded me with A 50 GB on my contract phne an 200MB on my prepaid phne .However I did not Authorize this .I received no call SMS or email an coincidentally I was in hospital as an ICU pt on the 5th January. I have requested for the call log to be urgently pulled out to Prove I Did not Action the Rewards . Vodacom to Date has not given me the Call Log an Continues to Bill me this Exorbitant amount