Lack of communication

I had an account with them in 2019 I stopped using it. Mid year last year I got a call from they collectors that I owe R4000.00 . Mind you they have never sent any communication that the account is accumulating charges. I finally went to the brunch on the 30th June 2021 and called they complaints department and Luyanda promised the I will get a responses by the 01 July 2021 but still nothing has been said about the outcome of my complaint. I sent an email and not even a automated response was sent.