Bad service

We bought a Polo Vivo brand new in 2018 from Barons Postmansburg.

September 2019 we sent it in for 1st service(we did took out a service plan when we bought the car).

On the 9th August 2020 we took it in for the 2nd service only to find out that they didn't do the 1st service and that they didn't had any records of the service.

During the 2nd service they also couldn't found our service plan(service plan that we took out from them)

We asked the manager at Barons Kuruman(they moved from Postmansburg to Kuruman late 2018) why can't they find it on they system and he got really arrogant and told us we are wasting each other's time.

Our main problem is that when we want to trade the car we will get penalties because it service plan is not complete and when we told him that he said he won't penalized us(he assumes we going to do business with him ever again).

The Managers name is James van der Linde.Very arrogant.

In such case what can we do?