Lost baggage

my flight was delayed so i will not able to catch my flight. So they me to rebook or refund. I had cancelled my flight. But the thing is i have already checked in my luggage. They have not returned me my bag, they told they will fedex me. But i have not received my bag. It has valuable items.

Cancelled second leg of a one way trip and will not book on another airline.

My son , who's age 3, and I had paid tickets for a flight. We together boarded and completed that flight however frontier is saying my child never arrived. Lord forbid my son went missing or got lost in the airport the airlines would dispute that no child was ever there. Now we have a flight plane issue.