Telkom debiting me for a fully paid and canceled contract

I received an email notifying me of my upcoming contract and if I wish to upgrade or cancel of which I asked them to cancel 2nd week of January 2025, it was confirmed that they are going to debit me one last premium end of January since I did not terminate well on time. To my surprise telkom debited me for a fully paid phone in Feb and when I called them I was told that unfortunately I didn't terminate my contract on time as the cancelation was only processed on the 31st January despite me requesting for a cancelation 2nd week of January. I have been on back and forth with them, no one is giving me a well informed feedback. I do not understand why I am debited for a fully paid phone