After you file

I was hit with tax topic 151 and received a letter to reply with verification that my 3 children (the same 3 i claim for the last years without an issue) had lived with me at the same address as me. Well yes of course my children lived with my wife and I all 12 months of 2020. Irs received my verifying documents April 9, 2021 and they have still yet to process my return and send me the balance owed to me and when I've called im being told its first come first serve and I just have to wait until they get too mine to be released direct deposited to my account. The patience is key but a person can only take so much till someone has to be held accountable and answer to this mess!