Will not cancel my Vodacom Insurance

<p> Since September 2016, I have been asked Cellsure to cancel my insurance. They took ages to activate my cover, then they covered me for the wrong amount and then I noticed I was being charged 2 amounts for insurance on my Vodacom invoices. Although I did receive an SMS stating my insurance had been cancelled, I am still being charged. I have copies of all the emails I sent to ********** and ********** and I have not received a single response and this has not been resolved. I would like a refund dating back to September and my insurance cancelled immediately. </p>