Charged for service not provided:Discovery Insure

I have been complaining since January 2015 that my DQ Tracker is not registering the correct data on my Vitality Drive Dashboard. I have now demanded a refund for the past 15 months for paying for a service that Discovery Insure hasn't honored. I have had no reply. Discovery Insure have now admitted there is a problem - which I've complained about for 15 months and they've denied - but instead of assisting me to have it replaced, they've sent me a discourteous email telling me I must get it sorted out. I find their attitude and service deplorable. I'd like this message to be spread over the public media as I know others have also be at the receiving end of their shoddy unprofessional service.