Unfair treatment from Telkom

I'm currently having a horrible experience with Telkom. I signed up for a 2 year wifi contract at the end of 2019, and I was under the impression that it would end in October of 2021. Instead, after the 2 year period that I agreed to, Telkom kept billing me every month. No one told me that this would happen, and I didn't notice their attempt to take money out of my account every month until May 2022. When I went in to query this, they told me that I owed them R7000 and the consultant that I spoke with even said that automatically moving to a month-to-month payment wasn't in the contract that I signed. I then asked to cancel the contract and she told me it wouldn't be possible. I was very upset and confused so I left. I went back again in this week and they told me they won't cancel my contract until I pay R6000. When I told the consultant that I don't have that money, she said that the contract will not be canceled and they will keep billing me, adding to the total amount owed, until I pay. I haven't used the wifi at all since October 2021 as I was under the impression that the contract was expired, and now they're making it impossible for me to cancel or dispute them charging me at all. They've been completely dismissive and basically told me it's not their problem and I have to sort out R7000 for a service I wasn't using, and they'll keep charging me until I pay the full amount. I also went onto the website a week ago and tried to cancel online, asked a consultant to contact me but no one has gotten back to me. In fact, I haven't had contact from telkom since the contact 'ended'. They haven't informed me of late payments or bills due at all, which is also why this situation is such a big shock to me because I really thought my contractual interaction with them was done and dusted. Any advice on how I should proceed would be much appreciated.