Re: Overland Dash Stitching
Personally, I would use a little fabric adhesive (from a Joann Fabric store, Target, etc). Take a fine pointed toothpick (or a small nail) and put a drop in the hole the tread goes into. The use another clean toothpick (or a fabric thread pointer - I borrow my wifes), and carefully poke the end of the tread into the hole until it looks right. Let dry for a few hours.
Your dealer made a mistake of tucking in the thread without using the adhesive, or did the repair incorrectly.
I have done this many times, even on convertible tops (using a waterproof version) and have never had the thread re-pop or unravel. I did this on my GC front seat where there was a loose thread, and you would never tell it was done. Many dealers do this on cars in stock or before delivery when detailing - very common. Personally, this type of "repair" is a better option than tearing your dash apart to replace it. The cure may be worse than the disease...