Dealing with HellKOm

I cancelled my landline account using the web portal of telkom on the 27 November 2020. To date (26 Feb 2021) my landline has not been cancelled. I've made 5 telephonic calls to the call centre only to be told that the consultant cannot cancel on their system because it reads an error. Each consultant has verbally informed me that the matter would be sent to the technical divisions , by email, to cancel the landline. Phone calls have been made on 19 Jan, 21 Jan, 29 Jan, 4 Feb, 5 Feb 2021. On the 14th Feb 2021 I went to the Glen Telkom Direct office and logged my call. I was told that they will get back to me with within 48 hours. It's now 5 days and no call. I'm still receiving a monthly bill with no end in sight of the landline been cancelled.