Problems with cancelling my Telkom line rental.

I requested to cancel my Telkom line on 11 February 2018. I submitted all required documents which as the cancellation request form and copy of my ID. I have yet to receive my cancellation confirmation letter. I do understand that my March debit order would run as normal which was not a problem. My subscription with Vox was cancelled and dealt with very swiftly as they were my service provider.

Now I don't have a service provider and Telkom just sent me a statement informing me that they are going to debit me again on 1st April. The comminication and service that Telkom provides is absolutely pathetic. I expect that Telkom would sort this problem out before I get debit again for a service I don't use.