misrepresantation

I phoned car track because I had two cars already using their tracker. When I wanted to add the 3rd one I was told that because I'm an existing customer I qualify for a fleet package so I opted for because I was told that all my cars will have the same tracking device which comes with extra options. After the 3rd car has been fitted with the new tracking unit I realised that its different from the 1st two cars when I'm phoni cartract I'm told that they would differ because not all my cars are under fleet package only the last 1. If I want the other two to have the same I would have to pay an extra fee for upgrading and also pay more monthly. The guy I spoke to told me there is no such thing as I qualify for fleet because I'm an existing client they are only running a special for fleet only. I really feel that I've been **** to. Peter please help