Telkom - Is is impossible to get them to perform a service cancellation?

Submitted fixed line fiber cancellation in January 2019 and received an email from Telkom stating the following:

• Cancellation Order Number: ********** 23A • Your Request to Cancel: Fibre • Service Number/s: 021******,TIN2200*** & B13000***x • Cancellation Effective Date: 16/02/2019 • Order backdated: 16/01/2019

No further communications post that to confirm that cancellation was done, yet I still receive a monthly invoice and usage report.

It also seems this is a very common issue with Telkom and it is a massive headache to get a service cancelled.