Contract I dont know of…

I’m not happy, I app**** for a cell c contract with a mobile device but after 24 hours I called cell c to cancel. They said it’s cancelled, I even got an SMS confirming that it’s cancelled. After 5 days they delivered a sim card only at My work place and I immediately called cell c to inform them, they gave me a case number that it will be fixed. I didnt open the sim, I have a sim only contract. When I go to my app an amount was added, I called and I’m told I have another sim only contract that I never agreed on. Been trying to get help but cant be helped, atleast to get a devices then than another sim only. I’m disappointed on Cell c