Stop in for a cup of coffee

Customer calls all bent out of shape. Battery in car is dead.
It was recently replaced along with alternator.
I had nothing to do with either.
I diagnosed a bad alternator about 8 months ago, took it elsewhere to get it changed.
Calls, says car has to be reset after replacing battery.
Thats what his buddy said.
Ya, he is about to be told to go jump in the lake too.