Airbag light keeps flashing
Then you need to take it to a mechanic for diagnosis and repair. Your airbag system will not function in an accident until you get it repaired.
Did that they could find out why the lite stays on had it for a day
I think you meant they could not determine why the light was on. Air bags are almost always a dealer type repair so maybe you went to a mechanic that is not trained for that service.