Contract to be cancelled/no response/bad service

I am so frustrated! I went to the Telkom customer service in Mall at Carnaval..spoke to Mr Graaf who promised to cancel the unlimited option that was added on my account,he told me it will be done within 24hours,gave me his personal e-mail that I can confirm. I was under the impression it was done,but send him a email 2weeks later just to confirm,he didn't respond,i phoned cancellation dept,they said nothing was done and I have to phone the branch because it was done at the branch. Phoned the store Manager Simphiwe,(10/8/2018)he promised to take it up immediately with Mr Graaf and will phone me back on 13/8/2018.Neither of them phone me back ,I tried to phone several times but he did not answer his phone. Send a complaint to Telkom..no response..went on Telkom chat 2x,they told me they can not assist with the cancellation but will be able to assist with the claim for the the amount they charge from April extra.. was out of the country for 16 days,when I come back I phoned Simphiwe again he promised to immediately take it up with Mr Graaf also promised to phone me back same day.. no response.. send again a mail to Mr Graaf (3x) still no reponse..try to phone Simphiwe.. don't answer his phone...Although i told Simphiwe.(store Manager)and Mr Graaf( in a mail) I am taking matters further if they don't respond, they just ignore it.