Upgrades and Cancellations

I’ve been trying to cancel my contract with Vodacom since 25th March 2021. I spoke to some lady which I forgot her name, she convinced and offered a deal I liked. To my surprise no delivery after 7 days. When I call back they don’t see any purchase order on my name, yet today 01 April 2021, I’m paying my bill... I called again today 01 April 2021 and spoke to Busi who said a lady will call me back by the name of Yvonne in 5minutes to my surprise it’s been over 4hours now still no call..... I wish I could just stop making payments but my credit score will be affected, I guess that’s what Vodacom plans as they can’t seem to help me upgrade nor cancel so I can move to other service providers