I got 5 bad alternators in a row from autozone a few years back. They still refused to refund my $$ just get another replacement. I finally resorted to picketing in front of the store. That got me the phone number for the regional manager. I agreed to try one more IF she would send it to a store with a tester and if it tested bad out of the box I’d just get my $$ back.
Sure enough, the 6th one was bad out of the box too. Got my money, went to OReilleys and got one that was good on the first try. lol