CELL C Upgrade Consultant Rude with no Customer service

I've been emailing cell c to confirm my end of contract cancelation, no acknowledgement. Last Thursday a consultant called me to upgrade, I gave her the opportunity to present the products to me but nothing was online with what I wanted so I declined the upgraded. While still speaking to her, confirmed once again my end of contract cancelation, she told me to call customer service as it's not her job. I was still speaking and she wasn't bothered, proceeded to intentionally cut the call on me because she didn't get the upgrade. Will never deal with cell c again!!! Another agent called me on Friday to upgrade, I explained to him what happened and requested to speak to a manager, he promised me that someone would call me by 3pm. To date nothing