MTN Contract cancellation unsuccessful!

I have a 12 month contract for a 3G simcard with MTN. Towards the end of the contact in July 2017 I phoned to advise them I would like to cancel this contract and was told it is a 24 month contract. I was sent from pillar to post, I went to 3 MTN stores, was told to phone the call centre and then finally told I had to go to the store where the contract had been signed. At each point I was told it is a 24 month contract despite having the 12 month contract in my hand. I scanned it and sent it to them and have received little joy.

I am asking them to cancel this contract as per my first request effective 6 July 2017 and to refund me the premiums they have taken out of my account since then which is July - Feb, 8 months @ R99 - R792

In the below email the person at MTN acknowledges that this is a 12 month contract even though entered on their system as 24 months.

--Original Message-- From: ********** Date: 2018/02/14 10:52:42 AM To: ********** Subject: 1- ********** 3752 Y’ello Team Kindly assist as per contract signed by client they are on a 12 month contract as per system it shows 24 months. Client will like to cancel the line as is fighting for us to honour agreement signed by them. Contract attached. Appreciate the assistance. Maartens Hattingh | Cell: ********** | Email: **********