vitality drive is terrible

I am having major problems with discovery vitality drive since september 2014 when i joined.<br> <br> Fist i booked a tracker installation and then no one showed up. Then i got a phone call from discovery telling me there was a tracker in my car from the previous owner and so no need to install a tracker.<br> <br> I thought ok thats fine but then when i start getting my scores they are all wrong and very inaccurate. For example the distance covered which i can monitor myself is completely wrong! I queried discovery about this and they said the tracker was working fine. I did not believe this so I contacted the previous owner of the car and he said that the tracker had been removed before he sold me the car!!. So now I am wondering what the hell is going on with discovery vitality drive. I have asked for the raw data from discovery for the previous months to prove there has been a tracker in my car and that is working but they wont provide it. Currently I am exploring my legal options against discovery as this is just shocking as I am paying for service im not getting. Reference numbers for my queries are ***, ***, ***, ***, ***, ***, ***, ***