Cell C won't cancel Getmore subscription

I have recently been amazed that Cell C are still charging for a Getmore service I asked to be cancelled a long time ago. I have done this twice already and at first I thought it was an oversight. I have never used this service hence why I wanted to cancel it. This is not helpful for the image of Cell C and I am starting to have doubts about the ethics of some staff members there.

This was following me being send and extra sim card for 500 MB data when I signed a tablet contract in early 2016. Initially I thought this was not a big deal but now think it was a way of generating sales by the sales staff. By the way, this costs me R175.00 a month which is more than twice the amount I would pay for a gig of data.

Overall I have been a happy customer but feel that I have been and are being taken for granted. This is not acceptable and I am seriously considering not renewing any of my contracts when they become due.