Bad service from contract department

I bought a cellphone through contract (24 months contract) in 2018 September at vodacom. Everything went well, paid the phone through this 24 months. On the 24th month, I called vodacom prior to their deduction of last installment to let them know I have no interest in continuing with them and they should close my account. The constant I spoke to asked me to be moved to more cheaper sim only contract inwhich I was going to be paying even less amount (R69 for R125 airtime and 1Gig Data). I agreed and asked if that will reflect on my online portal that I'm now switching and he confirmed. Few days later nothing was changed and I called the call centre to cancel everything since they are not serious. They agreed. When I checked nothing was changed. The following month they debited and I called to address my problem, and they told me a, supervisor will call. No one called. I reversed the funds. They debited again following month, I reversed. Now they no longer debiting but they have listed my account as upaid on Experian. I don't know what is it that I had to pay when the contract has ended.

Advice: Don't take contract phone with vodacom if you care about your credit rating. They will make sure you leave them in tears. They just don't care