Assistant manager shouted at me then dropped phone

I went to get a new contract in store at the Glen on the 13th April 2015. My new sim card was not activated in the 3 hours promised so I called activations. I was told that the sim card was deleted and I should go back to the Glen for assistance. I was made to wait for an hour and still left with a sim card that was not working. The assistant store manager Nhlanhla called to say it would be active by the 15th April. The sim card is still not working and when I called him for assistance he threatened to hang up the phone which he did. He refused to assist before subsequently putting the phone down on my ear. What must I do with this non active sim card that I am paying for. Is it fair to be without a phone for 48 hours and still get no assistance?