Sorry to hear about your experience. I'll be glad to check your Nest Thermostat on why it won't connect to the WiFi network. First off, could you tell me what type of Nest Thermostat do you have? Here's a link that might help. And are you getting any message codes? Also, it would be great if you could specify all the steps you've tried just to cover all the bases.
Looking forward for your response.
I wanted to check in and see if you managed to see Mark's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.
I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.