Sell direct - absolutely poor service.

Hi there. I was offered a routet/data contract by an agent from sell direct about 2 weeks ago. On the 9th of April I received the router via couriers. Ever since the sim is not activated even after another agent called me to confirm Rica and activation. I've been trying to call the number they gave me to no avail. What do I do next? How do I pay for something that doesn't work?