RCS trying to rip me off for a confirmed closed account.

I previously had an Edgars account, which I canceled end of August 2020. Note, I never went into an agreement with RCS for an account. I have never had an RCS account. How did I end up with RCS. I received a letter, dated 03 September 2020, confirming the settling and cancelation of the account. The letter confirm the account reflected R0.00 and will be closed on 08/09/2020. So for all intense purposes I considered the account closed, settled, terminated, etc. Unfortunately I am still receiving sms's and emails stating I still owe Edgars/Rcs. Why am I still receiving these notifications? I settled and closed this account and have an email stating confirmation of cancelation What is RCS trying to pull here? Please rectify this error.