No Feedback at all

I have sent multiple requests and phoned to have my telkom mobile 15gb Promo to be cancelled as it's past upgrade due date, I have completed the cancellation form and sent multiple times and phoned, when I phoned I was told to complete the form and email it to the cancellations department and that was the process I followed. I have not even received an email to say we received it or it's being reviewed nothing, and guess what, my 15gb promo is still active today after requesting, I switched the router off completely as I will not use any of the data as I requested it to be cancelled. I have the uncapped broadband deal with you now so dont need the 15Gb promo anymore. please cancel this as I can't afford both contracts.