Bad customer service

I'll never buy a car from Big Apple Motors again. Sales consultant known as Zee sold a car to me. When i test drove the car the service light came on. He promised me the car will be serviced before i collect it. I collected the car a few days later and the service light was off. When i checked the service book a few days later it wasn't stamped. I followed up with him and after a lot of back and forth i dropped the book by him for it to be stamped. A few months later the car started to act strange and i took it to a workshop. And they told me the car needs a service as the spark plugs needs to be replaced and the air filter was dirty. I followed up with Zee and he told me that Big Apple Motors have a in house workshop and they did the service and he'll get the invoice that show the car was serviced. A few weeks later i didn't hear anything from him and i followed up again. He said the spark plugs wasn't replaced on the car it was just oil and oil filter. And before purchasing the car i asked him if certain things will be done and he said yes. And Zee even confirmed it wasn't done. Not getting any feedback from him and he's now ignoring my call as well. Lots of back and forth for the past few months with Zee and i didn't come anywhere.