Request for refund from intellicell amount R449

I am very disappointed with intellicell, I had contract which they debited the amount we agreed on and I took the contract over the phone, then contract finished 24 months in December 2021 as my first debit was 20/21-01-2020 but instead of contract to be stopped they debited me in January 2022 with another R449 of which I am not happy because I served 24 months and why they robbing me because in January 2022 it is a 25th month, and now when I asked for refund they said because I did not cancelled contract so they won't be able to refund me so which mean I lost R449 and I was not explained that as I took contract over the phone, so now they sent me agreement with that information but it was not sent to me the day I took contract but now because I want my money they tell me all this nonsense, intellicell I need my January 2022 installment R449 back to my account, I can not work so hard for you to take my money even when 24 months expired. Now I regret of why I took contract with you because if I knew this will happen I was going to not make a deal with you. I want my R449 back and I don't negotiate I want it back