My car has a check engine light on yesterday, I...

My car has a check engine light on yesterday, I took it in to get checked, and the part I need fixed is 900 bucks, plus I paid 106 bucks for testing.. only to be told my emissions warranty was expired. My warranty has NOT expired, it's good until 3/11/2021. So who ever told the guy that was working on my car was not listening to me when I told them it was still under warranty.. Mason Sheets is the person who I was dealing with and it was like talking to a wall. I'm not happy at all with the service I experienced yesterday plus I'm out 106.00.