In October of 2016, I took my Prius C in for its f...

In October of 2016, I took my Prius C in for its final "under warranty" service. I was told that the air filters had to be changed, but this was not covered under the warranty. I complained and ended up, in a huff, telling them that I didn't want the air filters exchanged. Last week I brought the car in for a service and suggested that the air filters would definitely need replacing. They said they would check. 30 mins later my car was ready and when I queried them, they told me the air filters were fine! I told them I had been told 6 months earlier they needed replacing. They offered to show me that while there was wear on the filters, they were okay. Which means at the appointment 6 months earlier, they were planning on scamming me to buy new air filters I didn't need. Anyone got a suggestion of where I can get my car serviced by honest people?