KIA Wonderwater Multi franchise is useless

I bought a car there 2 years back,now recently the battery of my original key has stopped working only to find out at another dealership that the spare that was given to me is not for my car, and it is faulty.I called in to get assistance from a manager unfortunately, I couldn't get assistance because the manager told me that the salesperson who sold me the car 2 yrs back is no longer working there and therefore they will not be able to assist me.I have tried to get hold of the sales person as well but without success Now I'm stuck with a car, that does not have a spare key.