Harassment due to their own negligence and mismanagement

I am staying at Capital Heights and I have been harassed for to pay a rental increase that I was not informed about and also i didn't not sign for it. I would have moved out long ago if I was informed. Rina send me an email in Oct 2022 saying I must pay more and I refused to pay more because I have explained to her that I didn't know that the rent went up. OFentse call me and I asked her to call back at 14:00 and she never came back, then Barend send me a WhatsApp today 21/11/2022 saying I must pay the arrears and I also explained to him. I'm paying this ppl every month and on time, but keep harassing me for their own mismanagement. They causing me a distress. This is unfair practice and harassment and one deserve this kind of brutal treatment. I'm moving out in Dec 2022 and I hope they will give my full deposit as per our signed contract. Please assist that they stop harassing me as am paying them every Monday correct.