Bad services receive for RCS store card, VVM and MBD attorneys

I had an account with RCS store card. i was struggling to pay the account during the time of COVID. My account was then handed over to VVM with the amount of R40000. I paid up the account with VVM in full during February 2022. i requested the paid up letter at VVM several times through phone calls and e-mails. they told me the letter was sent but i have never received a letter. then i am receiving calls and massages and emails from MBD attorneys demanding payment on the same account. i don't know why RCS has handed over account to other lawyers again for one account which is already paid and the account was closed. is so frustrating