Email sent and still my account is not closed.

On the 3 June 2015 I sent an email from [Email Removed] to cancel my contract as I am retired. I made sure from my side that there will be no problems. But Cell C just wipes there .... off from me. 9th Nov 2015 I resent the email and still no response. I sent another email on the 27 Jan 2016 - and well still no feedback or reply on my email, and they are still taking my money out of my account. I did advise I will return the debit orders as these accounts must be closed.