Rain Month to month services - unprofessional collection and no accountability and admin

Terrible customer service! No checking if emails! I had a month to month subscription and in May 2022, I stopped using their services. They kept calling and emailing me about outstanding fees. Even though I stopped using their services, I paid an additional months fee post stopping using their services, emailed the proof and never heard from them. A few months later, they said I owed about R2000 and when I referred them to the proof of payment I made, nothing was ever done about it. To date, I still receive emails from them demanding payment, and whenever I forward them the proof of payment email, they ignore and reachout with a different customer service person weeks later! Please sort this out as it will reflect bad to my Credit score! Again, I had a month to month subscription, how do I owe months later after stopping using your services?!