Cancellation of contract "not received"

<p>I have been a costomer of Cell C for 6 years. My contract should have expired on the 7th May 2016. I knew I had to inform CellC about cancellation of the contract and did so in written format, more than a month in advance (26 April), via email to costomer care as well as via self service on their website. When I phoned on the 10th May to find out what the status is, I was told that they did not receive anything and that I can only cancel the contract a month in advance which now means that I still have to use their service untill the end of June. I find this unacceptable that big companies are just allowed to ***** your money like this by claiming they did not receive anything therefore you will have to pay them for another month!</p>