Travelstart renege on ticket Insurance cover

I booked through this operation for a Kulula flight and in addition to the ticket cost, I paid a premium for AirlineLiquidationProtection. As you know Kulula collapsed. I have been trying to get a refund from Travelstart for the past six months using their suggested correct procedures. To date, I have not heard a thing. How do I get action? I am not asking for a favour I paid a premium for such an eventuality and am entitled to a refund. HELP