I would write them a polite letter of complaint. Address it to the management. Chances are they won’t look here. Hope it works out for you.
I have an ongoing saga with a brand new Zastava M91 sniper rifle, failures to extract, every 3rd to 5th shot. It has been worked on by a Zastava USA gunsmith who reamed the chamber and changed a magazine catch. He shot it, “checked out okay”, sent me a free mag. After first 20 rounds, problems recurred, somewhat less frequent. I shot 300 rounds of 7.62 x 54R light ball Russian ammo so far, using the recommended adverse setting per manual, functionality is unacceptable, so it’s going back. They promised to work on it again, and if they cannot fix it, that they will replace it with a new one. Hope so. Makes you wander about the quality assurance in the current Eastern military arm factories.