Very very bad service at Kia

Very bad service from Kia Fountains, I bought my car with them November 2017 (brand new) , 10 months down the line I found out that my car's Vin number does not correspond with my personal details, apparently the Vin number is registered under someone else, when I call them to fix the problem they told me they are dealing with it right away and they will get back to me but I'm not receiving any feedback from them and when I call them again they are not giving me the answers that I want. I'm even thinking of taking the car back to them because I can't be driving around with a car that is not registered under my name