Telkom contract never cancelled and debit order continuing

My mobile contract expired for my wifi router no I gave a calendar month notice to cancel on 02 February 2018. I made several requests for acknowledgement of receipt and this was not received. I called the call centre and emailed the forms to ********** and had no response as promised. On 18 March I called the call centre again and sent the forms again. I told the operator that nothing had been done and I wanted to hold while it was done as I was going away and had subsequently cancelled my debit order. After 45 minutes I was told this was done. Yesterday I saw that the debit order had gone off AGAIN and the contract was not cancelled, the SIM card was blocked!!! I rep**** again to Veronica Basetsana requesting she contact me to sort this out but have had no response. I would like a full refund for February and March . There is no reason the debit order should have gone through, by all accounts it should have been blocked by my bank (which I will take up as another matter)