Cellc BS company

I can't believe that I'm still fighting cellc even today to close my account which expired 2 years back, they send me a statement saying I still owed them a balance of R350 on my account, for peace sake I paid the amount unfortunately paid it with a an incorrect reference number, I called in their customer service center to rectify that & provided them a prove of payment frm my bank but since then which more than 3months the no correspondence about my case till today and I've been receiving statements saying I'm owing so by Jan 2022 decided u know let me pay this R350 again on the same balance course clearly since I'm dealing with a BS company they won't come back to me about my case so immediately(like seconds) after making that payment I called them to find out if really I had n outstanding balance then they said no my account is on zero zero so that means a payment which I just made is for nothing so same time I requested a paidup latter they gave me an email address were I should send my request, fine, ohk cool so now is the 7th of Feb 2022 I jst got a new statement saying I'm owing again this time R20 balance is still pending on my account. Ohk cool can the ***n cellc CEO then deal with this account & close it course clearly no one can they are all useless. Mxm