What was wrong with my new thermostat

I just got a new smart thermostat. My old one was broken because my pet ended up killing it. That’s a long story in itself. But my new smart thermostat had a slight issue with it that turned out to be a factory defect. The digital display of the smart thermostat was not reading right. And it also kept going out on me so I could not see what was going on with it. I yet again had to call back the local heating and air conditioning company to send out a certified heating and cooling worker to replace the smart thermostat. This time there was no charge at all because this was an error on their part for not checking out their stock to see if it was a defective one or not. The heating and air conditioning company apologised for the mess up and replaced the smart thermostat with a proper and fully working one. They told me that my issue actually woke them up to a potential ongoing issue with the last stock they had got in. And that they are going to start going through everything and checking them. So my issue alerted them to a possible issue. Not that it benefits me in any way, shape or form. But I was happy to know that this would not happen to anyone else who may either buy or need a replacement of their smart or digital thermostats in their home. This smart thermostat should end up lasting me a lifetime I would think. So long as my pet doesn’t find a way to kill this one too!
electric furnace