incorrect billing.

In November last year I was called by homemark/afrizon on behalf of vodacom. They offered me a contract where I would be paying R59 for 100 uchoose and they person even confirmed I will be paying that amount to my surprise the was 2 sim card in the package received. Them 2 days later they debited my account with an amount of R388. I went to vodacom customer care in Eastgate to enquire about the sim card which I was never told about. I requested that they cancel both the contract,which was still with the 7day cancellation period,Beverly told she will send an email to request cancellation and I should call homemark which I did spoke to Sandra and she confirmed it was cancelled. I even sent to escallation department and they rep**** request they collect the phone. Till today (20.03.2015) phone has not been collected and im told I have arrears of 7500 to vodacom and threatening legal action,where this was their fault and I have proof of all this communication. I am furious and the incompetence and lack of communication skills,false information given to customers, this is now affecting my credit record.