Sales Manager and staff do not want repeat business

I bought a demo Venue from this dealership in May 2022. During the final discussions, the Sales Manager told me that as I am retired, the maintenance plan will give me peace of mind for the first 3 years. Having just gone for the second service, I was told by the Service lady that I only have a service plan. Taking it up with Hyundai SA also did not help as everybody on the Sales side at the Dealership now just deny everything. Find yourself another dealership for Hyundai. The Sales staff do not understand what Integrity means. Worst dealership I dealt with ever.