Expensive Hyundai car with no service plan, misleading the clients....

I would like to complain about the fact that I was misled by one of Hyundai's sales executives. We purchased a car in April 2021 which was bought on very low km's and the reason why we purchased the car because we had to trade in the other car due to the service being expired and the high maintenance it would've cost us at the end of the day. We purchased this new car, with a service plan "according to the sales executive", the deal went through etc etc. We were notified than on 45 000km we need to bring the car for the service, we contacted the service department and that is when we got the shock that the car does not have a service plan. I was ****ed off to say the least, because I mean, the sales executive told me that he can give me lesser price on the car because it includes a service plan etc etc. We contacted him for answers and up until today we haven't received any. The Branch manager was informed, it's been more than a month now and no one has contacted us, because it was said that they will investigate it. I wish I could give the car back to Hyundai, but it's going to affect us in the long run.