Ongoing Issues with Closed RCS Account

I need help in closing my RCS account which was supposed to be closed in May 2024 already. I fell behind with 1 month installment and I contacted the call centre and made a payment arrangement to catch up the following month. I received numberless calls for collection after that and I stated that I already have an arrangement in place. The last arrangement I made in that same month, to stop the calls from coming through daily, I arranged to pay the settlement amount which lead to more problems, the settlement was paid and the debit order still went through. I contacted RCS again and requested for the account to be closed, I got an email confirming that it was done. Five months later, I started getting calls again for an outstanding amount after I had settled the account, I was told to visit Builders and I was not assisted when I got there, they were unable to search for the account. I received a different call and I was told to visit GAME and made a payment which was accumulating because the account had an insurance linked to it, I paid the amount they told me to pay at Game and I sent an email again to cancel the insurance for the charges not to accumulate anymore, this was in January this year. Now I'm receiving calls again stating that I'm owing RCS, just wondering if I will ever finish paying this account and really close it. According to me, I paid in May 2024 already.