Aire One Heating & Cooling Inc

I called saying my furnace was not working, they would send out someone, when the repair man arrived he said my wall thermostate needed new batteris, I think this should have been mention on my phone call so i could have changed the batteries, we had not owned our furnace long to never thought it was batteries, They charged me over hundred dollars and I supplies the batteries. It took him all of 5 min to change the batteries. I thought he may at least have mentioned the batteries on my original phone call or then reduce his fee. Not very good customer service since we also bought an new A/c from the same company and also sold the same to our son which I told the man when he gave me the invoice, but he would not reduce the bill,