Cartrack binding contract

my Titanic started sinking the day i got a call from Car track . i had just financed a car and i got a call that would make my life difficult . in the call i told the lady that i was told that i got a device already in my car from the dealer and they told me that the device in the car is with them they can see it in their systems and i told them many times that i need to first check with the dealer to understand if there's a misunderstanding. a guy called me again saying that they have spoken to the previous user of the car i just bought and that they need to install the device now that they have confirmed . long story shot .. there are multiple Tapes of me and them disagreeing about the stories . i ended up taking the tracker but i was confused ,i was forced by the product seller to belive that the device in the car is the very same as the one i got from a dealer .i canceled the contract withing 7 day as advice but i was told i cant . and the day before i took the contract i they told me that i can cancel it any time . now i cant cancel the contract i have to pay 3000 or else it will grow . i asked them then to go listen to all the tapes where i feel misled and they told me that they listened to the one that binds me the rest of the tapes are useless ....... anyone who can assist , i need to take this to ombardsman