Vodacom WORST company EVER

I'm disgusted with the service of Vodacom -see below complaint I'm an extremely irate ex client of Vodacom. I had a internet access through Vodacom which was terminated as the contract had lapsed but was still paying for the service, the SIM card had been deactivated & couldn't be used. I cancelled with cancellations dept earlier this year & now I get a letter of demand for and outstanding amount of R 320 for acct no ********** 5-4 and that I will be listed. I find this unacceptable investigate & advise by end of business tomorrow or I will escalate further. I also want in writing confirmation from Vodacom that I have not been listed Sue Brown - Got an automated response from the help desk to contact their call center where NONE of their agents can help , I've emailed their Legal Dept twice NO RESPONSE from them how the hell do you people operate. CONTACT ME TOMORROW no automated response . I really have no idea how people can use your service