Hyundai Durban terrible service

i have purchased H100 late last year Hyundai Durban Central. i was told by the sales rep that the vehicle will be due for service onced done 15 000 km after i asked before collecting the vehicle. to my surprise to day i am told by workshop that i have over-shot the service millage by 56000 and the service plan will not cover, i must pay from my own pocket. i have raised this and to my surprise, no one is taking responsibility. this is disturbing because how can i over-shoot service by 5000 km deliberately. i re**** on the sales person advise. and worse, when i collected the vehicle after doing paper work last year, the spare wheel was missing, and had to be replaced after couple of days. today i am told service book for the vehicle is missing and i must pay R30.00 to buy a new service book. what kind of service is this?