Telkom Billing after cancellation

Good Day,

I have been struggling with Telkom some while now. No matter what form of communication you use, you just don't get through to them. I have received confirmation that my adsl account was cancelled on the 30th of July 2018 REF no. ********** 23A . I had a outstanding balance of +-R 1600 which I was meant to pay, but still they are charging me and sending me new invoices each month. It is on R 3500 already. I cannot link my account since it has been cancelled to pay the R 1600 I am due. I am not going to pay for something that was cancelled way before. You cannot go into a Telkom store to pay either. Please can somebody rectify this?