Impossible to cancel lines with Telkom.

Shocking service from Telkom! I have been trying since 27 November 2020 to cancel 4 of our 5 lines with Telkom. I have now sent the specific documentation they request through to them 3 times on 27 Nov, 12 Jan and 23 Feb but with no luck. Last week I got our bank to reverse the Telkom debit order because at this stage they owe us money. Today I received an sms requesting a payment to prevent suspension of the account and threatening that should there be a second debit order rejection they will cancel the debit order and charge a deposit. How does one get Telkom to do what the customer has requested 3 times? Is there an ombudsman I can contact?