I was very disappointed with the service technicia...

I was very disappointed with the service technician came out to service my thermostat today. His first question for me was, "what is your problem?"
And I explained to him the touch screen issue I experienced with the thermostat and he told me "touch screen" isn't the functionality of the thermostat and the main function of heating and cooling are working. Unfortunately he was unable to see my point and claiming there's no problem and he can not answer it and asked me to contact the manufacturer instead. I am totally okay with contacting the manufacturer and have them tell me "yes this is a defective device".
I understand there's a procedure they have to follow for a warranty claim, but the attitude I received from him was rude and unprofessional.
I also mentioned I am the affected user on this device 24/7 a week and 365 a year. He mocked me by saying, "you are going to use this device all time 365 days?"
*Update*: manufacturer told me, upon my description of the issue, they concluded the device is defective and the contractor should have contacted manufacturer instead of homeowner for troubleshooting of the device.

Aug. 7,2019 edit: Arpi sent another technician, Kent, to follow up with the thermostat issue. Surprisingly, the new thermostat replacing today has a defective screen. However, Kent's reaction was 180 degree different than the last technician. He noted the issue and immediately went back to the shop to get another one. No question was asked. Arpi also offered a tune up on my furnace as a token of apology for my last experience. The new thermostat has been working well and I will change my review to 5 stars given that they are willing to address the issue with customer. However, I will not change the story about the poor customer service I received last time and hope they will address the issue internally.