No refund

In November 2018 I had my DSL line converted over to optic fibre. Since then I have been trying to get Telkom to cancel my DSL which I have been paying R432pm for almost two years. They can also look on their system and see that it has not been used over this period of time. Last week for the first time I was given a case no and it would get sorted out. They sent me a ref no and told me it has been resolved. They have reduced the amount but do not want to refund me for the two years that I have been paying. I was promised on Friday that the person that closed my case will call me as until now no one has ever contacted me. My telephone no ***.case no***7. Patrick.