Raw End of a deal on car purcahse

I am very disappointed with VW Fourways. Bought a car last year September with them. 3 times i asked about the car having a service plan, and the salesperson who was helping me told me that the car has both a service plan and a warranty. No, the car is due for service, and I find out that it does not have the service plan in place. I called the salesperson, who has since left the company, to ask him about it. He has since asked me for the VIN number and said he would check, but two to three days later he has not gotten back to me. i called the dealership and was informed that the car i bought doe snot come with a service i was supposed to have purchased it. I was taken through to the sales manager who tells me that there is nothing he can do because my purchase file does not have anything about the service plan and i have to purchase a service plan. he then told me that there is nothing he can do even after i told him that the salesperson told me that the car comes with a service plan. When we were busy with the process of purchasing the car it was never mentioned that the Polo vivo does not come with a service plan even though i asked about the service plan more than once and even when i went to collect the car papers i asked about and was told i must not worry it will be picked up on the VW website when i take the car in for service