you mean the handlebar crack, right? on the right of the picture? if we're looking at the same thing, that's overtorquing the bolts that cracked the bar. you can't safely ride that, and if the bike shop did that, they need to replace it free of charge because they broke it. A bike shop that cracks bars like this is crazy, and it's even crazier that they would pretend it never happened. It's not a safe bike anymore, and they know it. Realistically, you'd need to be super heavy, go very fast, and hit a pothole at exactly the wrong time to crash, but it's broken either way, and unsafe.