Wrong contract cancelled Cell C

I have 2 contracts with 2 sim cards each. Two expired in Feb 2018 and the other two Oct 2018. I phoned call centre to cancel the two expired in Feb. They cancel one from Feb and my data one which only expire in Oct 2018. They ask me to buy a sim card and Rica it, which I did and they were suppose to put my data on the new sim card. After 2 weeks I still have no data. I call the call Centre 10 times with no luck. I paid for the Feb 2018 (Wrong sim) which I did not used. Was also at the Cell C branch in Table Bay Mall with no luck! They more interest in their own cell phone than helping customers.