Breach of contract not receiving what was promised

I have a new internet contract with Telkom which was activated on the 8th July 2020. I have been experiencing a speed problem ever since . I have written numerous emails and worked with online help but with no success. I was given a reference number on the 16th July 2020 and to date have never received a call. I went to the online tracking system and it only shows it was logged and no further movement. Why should I pay for a unlimited internet if Telkom is on breach of contract. My reference number ***6.