Vodacom not removing default which is actually not a default!

I was a client of Vodacom for some time. I cancelled my account because there was a second contract taken on my name which was not my data device. I have paid for this second account for a year before someone was willing to assist me and then credited my account. Which was nice! But then I cancelled all my contracts with Vodacom and moved over to another provider. I got a R0-00 balance statement [note - not in credit] and I just moved on. May 2022 I have asked them to please make sure that they have closed my account, because I kept on getting invoices for a number no longer in use. I have not ported their number. Three months ago I have requested a Credit check on my name and noted that Vodacom blacklisted me. Upon enquiry, nobody answered me. I have paid this, out of desperation to get this off my name, sent the proof of payment and requested this to be removed. Still, nobody from their Client care, their collections or anybody comes back to me, and this is still against my name!! Will never ever in my life deal with Vodacom again!!