Did they tell you that they will reset it for free? Sometimes, once the job is done, they will give you the bill...
Last time, my dealership didn't fix my car's noise problem by providing their "believed" wheel clean service (that costed me $200). So, I called them about it, then they replied "Oh? Please drive it over and let our mechanic test-drive it again..." I know that I would be possibly spending another $200 for nothing so replied them "Just forget about it!"
Each time you ask for "help", don't forget to confirm the cost in advance!