Cancellation of contract

We have been struggling to cancel a contract with Telkom since July 2017, we have sent several emails to the cancellations department and to date nothing has been done. I have proof of all emails and can see it was read but no comes back you or responds. I would like this contract cancelled immediately and want the monies refunded back to me since August as this is when we have instructed them to cancel the contract. I have other contracts with Telkom and am a valued customer but do not appreciate service like this. Please contact me on ********** 672