Terrible Service from TC Kwande

Over 6 years ago i closed my bank account with Standard bank, and they handed over my debut account for collections from unpaid debit orders. TC Kwande contacted me last year and claimed to have the standard bank account handed over to them. They demanded that I pay them the installment fee, so I agreed. Then I kept calling / emailing TC Kwande for an updated statement on the amount outstanding and till this day I received nothing. Then someone emails me saying that Standard bank withdrew the account from them, OCT 2023, but TC Kwande is still debiting money from my account. TC Kwande is of no help i keep calling and emailing and they dont reply or answer.