Thanks for all the information
DAY 3, no news. The reason Quatar have been giving is the bad weather in FRA and the backlog. I asked Qatar for a claim and they refused at the airport. I will call the local Quatar office.
Also, I did give the tag number at Quatar counter in FRA and was entered into the system in front of me. But looks like that didnt help. It could have not made it to Quatar from UA.