Iv got my receipts from psa and foward emails to send the lower to the shop. But i agree id like to talk with them and try to get it replaced or refunded for what i had into it.
Or report it stolen if you have the S/N
Talk to the shop owner, pull no punches. Let him know your next call is to the ATF to report the FFL for impropriety and local law enforcement to report your lower stolen.