Vodacom failed to process cancellation

Yhuuu! Vodacom really doesn't want me to get peace in life. In march i requested that a contract line i had with vodacom be cancelled after it was **********ly upgraded but to my surprise i have been receiving calls from debt collectors claiming that i owe vodacom. This is after the whole issue of the ********** upgrade was sorted out and they refunded me my money. I called their collection department this morning and i was told that yes, i owe vodacom R700+ and then i asked the lady how can i owe vodacom money if i asked that the line be cancelled? she then transferred me to cancellations, i spoke to Nomthandazo who confirmed that there was indeed a request for cancellation in March. Nomthandazo also couldnt explain how i owe vodacom money since there was a request for a cancellation in March 2018, she then transferred me to their legal department but i couldn't get through because of their automated system that doesn't give you the option to speak to a consultant. This whole experience has left me speechless and drained. How are we suppose to recommend Vodacom to others if they are doing us like this?