Home Connect 3 months free special

I am so disappointed and upset with this company. I joined Home Connect in February 2021 on a month to month basis when they were running the 3 months free special. I took the 10mbps option. Earlier this year, they changed my option to 25mps without my consent which increased my fee. I let that go. In October 2022 I sent them an email notifying them that I am serving notice and would be cancelling my services with them as of 30 November 2022. They tried to contact me without success after my email and they did not process my notice. Instead, they said I must cancel using their portal. Their app does not allow you to cancel, I showed them screenshots of this and asked that they do it on their side. They refused to assist on their side and insisted that I have to do it myself, yet the app not working properly is not my problem and should not affect me! I tried multiple times, even using the website. I eventually cancelled but now they kept insisting that cancellation is for January because I did not serve notice on time, yet I served notice via email in October. They kept pushing for me to apply for a move order which has a condition that you have to stay with them for 12 months. I refused. Then they told me that by cancelling before 24months is over I now owe them close to R3000, I was beyond shocked because I did not take up a 24 month contract, I was on a month to month. They insist that by taking the 3 months free special I was bound to a 24 month contract. I keep insisting that I never agreed to this and they are telling me that I automatically agreed by taking up the option. I am confused because it said month to month. I then asked for proof, a document or something that shows that I agreed. They cannot provide this to me. They just insist that I owe them, with nothing to support this claim. I am so disappointed by this company and I refuse to pay for a contract when I asked for a month to month. Nobody has been willing to assist me, from my issues with cancellation up until this sudden amount that I owe.