No or slow service costing me...

My phone was sent in to be fixed for a warranty claim. I recieved the phone without the sim tray. I have contacted Cell c customer care for about 2-3 months once a week. On 3 of the occasions that I phoned they said that they wil send me a new sim tray and took my address to send via a courier. I have not recieved anything. Apparently everytime I cal they send an email to the relevant department but as of yet they have not rep**** on any of the emails. The matter has beet escalated a couple of times as well. Im thus paying for a phone every month without being able to use it. Seems like there is bad or no communication inside the company.