Billed after contract had been cancelled

<p>My 24 month contract with Cell C finally came to an end on the 18th of June 2016. They had advised me that I had to let them know a month before if I would cancel or renew the contract. I emailed them my intention to cancel, and they called me from retentions and we went through the cancellation. To my shock on my bank statement on the 30th of June 2016, there is a Cell C charge of R369.02 and my contract was only for R220 in any case. So I called them and they say the contract was never cancelled and now I am billed R161.85 per sim card for the benefits as the contract came with 2 phones and 2 sims. I was put through to retentions again and this time I insisted that confirmation of the cancellation be sent to me. I am deeply dissastified with Cell C right about now.</p> <p> </p> <p>Thanks</p>