Full product not delivered

In November 2015 Cell C called me to upgrade. I agreed to receive a laptop. The agent did not tell me that it was supposed to come with a modem. I received the laptop and signed for it. When my daughter tries to use the sim on the laptop she finds that there's no slot to insert it. I told her when i have some time I'll call Cell C and find out how to use the sim card on the laptop. The agent told me that they were supposed to have sent me a modem. She told me that she will put me through another dept and they will send me the modem. I told her not to put me through as i was going on leave from that day and as soon as i return to work i will call. So she said that i must call 084145 opt2. I now did and the guy tells me that its been more than 7 days and now i need to buy a modem. I don't think its fair as the agent did not tell me to expect a modem on delivery of the laptop. Please help as im a long loyal client of Cell C.