Bad service

So upset with Telkom. In June 2019,' I requested that my supreme call package be cancelled. And to go on strait billing which they did. Now when we open business in January I found out that Telkom has cancelled my line? They said they received a request in June to cancel. That request was for supreme call cancellation. And six months later someone reads the email and cut our line. Now they have to put in a new order, and they take their time and would not even make an effort to try and speedup the order, even if it is their fault. Where can I send a complaint. ?I have registered on line but cannot write a complaint.,?