Rain Account treated unfairly

I received my sim card in Aug 2022 then used it till August 2023. The contract was a month to month, so it means if you did not pay then you do not receive data. 25 August 2023 i did not pay, then received an sms on 31 that said my subscription was suspended so i decided to let go of rain. June 2024 I received calls from debt collectors that my rain account was handed over and that i owe R1600 .I could not understand because i have not been receiving data from them, but I made an arrangement to pay R246 monthly to settle this so called debt. I started paying end of July 2024. 06 November 2024 i received another call from rain saying i owe R1881 . I cannot call them because their number does not go through, i do not want to be black listed by i feel rain's service is a mess because they are not professional and still cannot explain what the debt is for. The lady said it is because the status on my account still says "Active". Did i buy status or did i buy service?. When i told them the first time that i do not want their service any more why did they not close it ? Can someone please assist me to get hold of rain because i am really not happy about their service and would not advice anyone to sign up with them .My number is ***, thank you