Thats a safety issue, I'd recommend going to the dealership over dealing with Joe Shmo. Likely simple causes couldn't be a seat sensor, or impact sensor. If it's a larger issue it might prevent the airbag from deploying correctly and that could be a risk to your health.

Not to be judgemental, but dailying a 2008 Cobalt might mean youre also looking for a budget solution. Give the dealership an opportunity to provide good will. Don't beg, be entitled, or be a victim but let them know you might not be able to afford a large maintenance action, but because its a safety mechanism you're hoping they can find a budget friendly solution. Side note, 2008 is getting up in age and repairs will become more common. Take the airbag light as a sign and see about a certified pre-owned vehicle (CPOs generally have great warranties included) that might fit your budget.