I wouldn't want to trust the same person to do anything again. I would definately want my money back and some compensation for the time it will take to un pick.
On that point the brigth side is tension off stictching is easy to unpick!
You have to cut the tight threads every couple of inches and then the other side can be pulled right out. You may need to cut more often depending on the shape.
Good luck, I had to un pick a whole bobbins worth once becasue I hadn't checked it... I was so angry with myself I had to walk away for the day and star a freash the next day.
Becks