Very unhappy. No customer Service

I have ordered the month to month package. I was asked if I have a modem. I said yes. They never told me it had to use a sim card. So I got the sim. So I have been trying for 2 weeks to get hold of them. I call from early morning to evening. The phone rings and then a voice note say your call cannot be answered. I emailed the sales lady more than once. Her name is Anele. as well as Shaun. They dont reply. I sit with a sim card that I cannot use. I tried to put it in my tablet and loaded 3gig data. Its all gone without me using it. I tried phoning ALL the possible numbers. No Luck. I tried the whatsup. I got one reply where I was asked if I went to the activation link. I asked him what activation link as no one explained anything to me. Im still waiting another week for his or her reply. Im phoning again today. No answer. Only your call cannot be taken. How the hell do I cancel? Does this company even legit? Or just *****ing our money?