He won’t be able to get the money back for his original smog test.
Dispute the charge anyway online just to make work for the slime and waste a bit of their time. Even if the answer is “no”, he’ll cause them a tiny extra bit of agida.
Corrupt people who exploit state requirements to cheat their customers are the lowest of the low in my book.
Also, report them to the B.A.R. — if enough people complain, it will also cause headaches for them.