Converting to prepaid

Been struggling for over a month now to cancel my additional sim on a 20gb data package with telkom. The number in question is ********** 109. IV gone through the normal website cancelation procedure as indicated by them on 23 May. They said it would take 21 working days. They claimed one of their staff members tried to call me 3 times but never got hold of me to confirm the cancelation which I feel is a lie as I always have my phone with me. They then closed the case. I have logged another cancelation request on Tuesday 18 June. I called them on the 19th, again on the 20th and they promised to escalate the matter and I would receive an email from the manager which I never did. I called again on the 21st to which they said a manager would call me and they never did. This is becoming very frustrating as, the telkom signal in my office is extremely poor hence why I'm wanting to port the additional sim to another network. Please find attached 2 screen shots of the 2 cancelation requests.