Bad customer service/ misrepresentation of a product/of no help

I purchased a vehicle from Nissan Parow May 2029. It was a Kia Picanto 1.0 Smart 2019 model and i happen to be the second owner. The vehicle was sold to me and i was told on numerous occasions ,by the sales person, that as per Kia the vehicle has a service plan but its a balance of one year. I was fine with that because it meant that i was covered for the second service and there after i would extend the plan to a further three years. And that i communicated with them. I did however not receive any documentation. To my embarrassment , upon me taking the vehicle for its second service, which would be the first service done by me as the second owner , i was asked if i was going to pay cash or with card. That came as a real surprise to me, because that was not the information given to me when I purchased the vehicle and now i have to pay for it. It was than established that the previous owner took out a month to month plan and it was cancelled whiles i was in the possession of the car. Neither Nissan or Kia is willing to sort this out or wants to take responsibility for what is clearly False representation of some sort. They are rather sending me up and down to sort it out. You cannot sell a product and make all kinds of promises, and in the meantime the promise is not being upheld and it becomes the fault of the person who bought the product? . So how does that work? Whos fault is it that wrong information was given ? Is it fair? Why must i be responsible?