Poor service at Vodacom

Good day. Who can I contact to log a complaint for poor service on the cancellations department and back office? I have been trying since the 30 Aug to cancel a contract that was ported to cell c.. and not getting any where with the cancellations department. I have emailed proof of payment and cancellation documents 3 times, received sms all in order and calls, then later not in order. Get told a different story now each time I call, have all emails, read receipts and email from a Pat Jacobs... Service is poor, please assist to get this done. Number has been ported but a dummy number has been allocated and contract not cancelled on your side... if you require I can email all correspondence that I just email Pat Jacobs on documents, sms and emails... I hold a number of other contact and vodacom staff leaving a poor taste on *** service... Latest email sent this evening with all documents and correspondence ref number received back from email is: Your reference number is EC-0XJG-3CAMAS.