Poor service Vodacom

Very annoyed with this poor service from this company. I phoned on 22 October to cancel my contract of R184 p/m. I decided I want to go prepaid. This fella who helped me really messed this up. He said i could get a 100 minutes for R50 to which I agreed. The contract wasn't cancelled and now Vodacom wants me to pay R184 plus R50. I already had prepaid airtime on my phone plus excess minutes from the previous month. On 22 November ALL my airtime disappeared from my phone. The 100 Minutes this guy sold me, were also gone. Twice I went to a Vodacom shop and the could not help me. I sent e-mails to Vodacom explaining the whole story. Now they want R358 I don't know what for. I cancelled my contract in time not to get billed again but the mess that guy made is eve too much for Vodacom to handle. My case is now escalated and I now have to wait 7 working days for an answer. Meantime their billing department keeps on sending me sms's for the outstanding amount. I am so tired of such poor service in this country.