HORRIBLE SERVICE

I am frustrated with the HORRIBLE service I received yesterday, I called in asking for a unit to be removed from my old car to another car that I am getting from the dealer, was advised that the second hand car I'm purchasing already has a tracker belonging to the previous owner and they can't deactivate it without the previous owner's consent, the previous owner was then contacted and she advised that she'll have it removed month end when she buys a new car, so should I drive a car that has somebody else's unit installed in it? What about my safety? Aai shame, your service is BAD, HORRIBLE!!!