Supersonic

I app**** for the MTN Supersonic Broadband service, was accepted, paid and my router and sim was delivered on Monday 14 December. I connected everything the evening I got home, however could not establish a internet connection.. I phoned every day since the Tuesday and on Thursday a technician went through the set up of the router which was working well, however it was established that the SIM card was faulty. Every time since then when I phone I was told my case is still open and have been escalated to a technician who will phone me back. Not once since Thursday 17 December have any technician phoned me back, in fact, I have been phoning just to hear the same story. If the SIM is faulty send me a new one what is the delay or excuse. I am fuming and very disappointed and I want this problem resolved urgently.